急求球体公式50球体面积,体积公式,
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szhualia 共回答了23个问题
|采纳率82.6%- 公式很简单的:
球体=4πr^3/3
球面=4πr^2
(其中r是球的半径)
至于这公式推导的的过程不是初中程度的甚至也不是高中能掌握的,涉及到高等数学中的积分,是大学生的内容 - 1年前
gz_happygirl 共回答了17个问题
|采纳率- 球体=4/3 π r^3
球面=4π r^2
初二程度还是不要推了,涉及到二重积分,等你上了大学,就能学到了! - 1年前
fionyang 共回答了1个问题
|采纳率- 三分之四乘以圆周率乘以半径的立方...
- 1年前
枫林石 共回答了24个问题
|采纳率- 体积V=(三分之四)(圆周率)(半径的立方) 表面积=(四)(圆周率)(半径的平方) 推导要用到积分,初二是不用掌握的
- 1年前
啄树鸟 共回答了424个问题
|采纳率- 球的体积公式: V球=4/3 π r^3 球的面积公式: S球=4π r^2
- 1年前
小小落叶 共回答了1个问题
|采纳率- V=三分之四π乘以半径的3次方
(注意哦,先做半径的三次方在做乘法,先平方,在乘除)好好看书! - 1年前
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Will power意志力
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D: You mean like trying not to play war craft?
Mike: right.
T: you mean like trying not to stay up late?
M: right.
Danny turns off his computer. Tommy gets up and goes to the bathroom.
Two minutes later the three maskeetters are working on their assignment.
Danny: Mike, can I take a little break? Let me play one round and we will continue our work?
Tommy: Mike, Can I lie down a minute? My back hurts.
Mike: No! No! No! Let's finish our work first before we do anything. We need will power!
Danny and Tommy: that's true. We need will power! We listen to you.
The end1年前查看全部
- 急求小学英语教师面试英文自我介绍
急求小学英语教师面试英文自我介绍
谢谢!六门1年前2
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yeen_bai 共回答了15个问题
|采纳率93.3%General Introduction
I am a third year master major in automation at Shanghai Jiao Tong University,P.R.China.With tremendous interest in Industrial Engineering,I am writing to apply for acceptance into your Ph.D.graduate program.
Education background
In 1995,I entered the Nanjing University of Science & Technology (NUST) -- widely considered one of the China’s best engineering schools.During the following undergraduate study,my academic records kept distinguished among the whole department.I was granted First Class Prize every semester,and my overall GPA(89.5/100) ranked No.1 among 113 students.In 1999,I got the privilege to enter the graduate program waived of the admission test.I selected the Shanghai Jiao Tong University to continue my study for its best reputation on Combinatorial Optimization and Network Scheduling where my research interest lies.
At the period of my graduate study,my overall GPA(3.77/4.0) ranked top 5% in the department.In the second semester,I became teacher assistant that is given to talented and matured students only.This year,I won the Acer Scholarship as the one and only candidate in my department,which is the ultimate accolade for distinguished students endowed by my university.Presently,I am preparing my graduation thesis and trying for the honor of Excellent Graduation Thesis.
Research experience and academic activity
When a sophomore,I joined the Association of AI Enthusiast and began to narrow down my interest for my future research.In 1997,I participated in simulation tool development for the scheduling system in Prof.Wang’s lab.With the tool of OpenGL and Matlab,I designed a simulation program for transportation scheduling system.It is now widely used by different research groups in NUST.In 1998,I assumed and fulfilled a sewage analysis & dispose project for Nanjing sewage treatment plant.This was my first practice to convert a laboratory idea to a commercial product.
In 1999,I joined the distinguished Professor Yu-Geng Xis research group aiming at Network flow problem solving and Heuristic algorithm research.Soon I was engaged in the FuDan Gene Database Design.My duty was to pick up the useful information among different kinds of gene matching format.Through the comparison and analysis for many heuristic algorithms,I introduced an improved evolutionary algorithm -- Multi-population Genetic Algorithm.By dividing a whole population into several sub-populations,this improved algorithm can effectively prevent GA from local convergence and promote various evolutionary orientations.It proved more efficiently than SGA in experiments,too.In the second semester,I joined the workshop-scheduling research in Shanghai Heavy Duty Tyre plant.The scheduling was designed for the rubber-making process that covered not only discrete but also continuous circumstances.To make a balance point between optimization quality and time cost,I proposed a Dynamic Layered Scheduling method based on hybrid Petri Nets.The practical application showed that the average makespan was shortened by a large scale.I also publicized two papers in core journals with this idea.Recently,I am doing research in the Composite Predict of the Electrical Power system assisted with the technology of Data Mining for Bao Steel.I try to combine the Decision Tree with Receding Optimization to provide a new solution for the Composite Predictive Problem.This project is now under construction.
Besides,In July 2000,I got the opportunity to give a lecture in English in Asia Control Conference (ASCC) which is one of the top-level conferences among the world in the area of control and automation.In my senior year,I met Prof.Xiao-Song Lin,a visiting professor of mathematics from University of California-Riverside,I learned graph theory from him for my network research.These experiences all rapidly expanded my knowledge of English and the understanding of western culture.
I hope to study in depth
In retrospect,I find myself standing on a solid basis in both theory and experience,which has prepared me for the Ph.D.program.My future research interests include:Network Scheduling Problem,Heuristic Algorithm research (especially in GA and Neural network),Supply chain network research,Hybrid system performance analysis with Petri nets and Data Mining.
Please give my application materials a serious consideration.Thank you very much.1年前查看全部
- 急求西班牙语自我介绍范例~
always_here1年前1
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小草下的大树 共回答了13个问题
|采纳率92.3%¡Hola!Encantado de volver averte.Mi nombre es ***.Tengo catorce años.Nuestro familia somos tres:mi madre,mi padre y yo.Mi padre es profesor.El enseña en la universidad de Suzhou.Mi madre es profesora.Ella enseña en la escuela de suzhou.Soy estudiante.Estudio en la escuela de secundario de Suzhou.Gusto mi escuela,porque tengo mucho compañeros.Somos amigos.Mi padres viven en Suzhou,porque mi puebla natal es Suzhou.Estudiaré más con estudioso.Viviremos una casa de nueva.El es muy limpio y grande.Mi familia es muy feliz.Pues gusto mi familia mucho.
希望有用喔.1年前查看全部
- 急求初中化学沉淀口诀
liu_qin11年前5
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shenqinzong 共回答了18个问题
|采纳率88.9%钾盐、钠盐、硝酸盐、铵盐 全都可溶 (一定)
氢氧化钠、氢氧化钾、氢氧化钡、一水合氨(NH3*H2O) 可溶 氢氧化钙 微溶 其它碱都不溶
硫酸钙 微溶 碳酸银 碳酸镁 微溶
碳酸盐 除(K、Na、NH4)其它都不溶 (以上都是溶剂为水)
硫酸钡 氯化银 既不溶于酸,又不溶于水1年前查看全部
- 急求a^4-17a^2 +16
chennn841年前3
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along0405 共回答了23个问题
|采纳率87%a^4-17a^2 +16 =0
(a²-16)(a²-1)=0
(a-4)(a+4)(a-1)(a+1)=0
∴a-4=0 a+4=0 a+1=0 a-1=0
∴a=4
或a=-4
a=1
a=-11年前查看全部
- 急求英语作文 People should mary for love
leila05731年前1
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一条棍 共回答了17个问题
|采纳率100%As a man ,after marriage ,make love is very impotant,1年前查看全部
- 急求韦达定理内容!
紫焰悠扬1年前4
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chenjiayun 共回答了15个问题
|采纳率100%一元二次方程ax方+bx+c=0 (a≠0 且△=b方-4ac≥0)中 设两个根为x1,x2
则X1+X2= -b/a X1×X2=c/a1年前查看全部
- 急求初二物理试卷
我爱琼海1年前1
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easylife123 共回答了20个问题
|采纳率85%力和运动测试题 班级__________姓名________
一、选择题
1、下列说法,物体运动状态没有发生改变的是 ( )
A.火车启动时,从静止变为运动 B. 在地面上滚动的小球,速度逐渐变慢
C.重物被吊车沿直线向上匀速吊起 D.汽车在盘山公路上匀速行驶
2、铅笔盒放在水平桌面上,静止时,在下列各对力中属于平衡力的是 ( )
A.桌面对铅笔盒的支持力与铅笔盒对桌面的压力
B.桌子受到的重力与铅笔盒受到的重力
C.铅笔盒受到的重力与桌面对铅笔盒的支持力
D.铅笔盒对桌面的压力与地面对桌子的支持力
3、关于平衡力,下列说法正确的是( )
A物体在平衡力作用下一定保持静止状态
B作用在物体上的两个力三要素完全相同,这两个力一定是平衡力
C物体受到重力和拉力的作用这两个力方向相反,它们一定是平衡力
D运动的物体在平衡力作用下,一定保持匀速直线运动状态
4、小明匀速爬杆,小刚匀速爬绳.有关他们受到的摩擦力,下面说法正确的是( )
A、因为爬杆时手握杆的压力大,所以小明受到的摩擦劙一定大
B、因为绳子粗糙,所以小刚受到的摩擦力一定大
C、小明和小刚受到的摩擦力一定相等
D、若小明的体重大,则他受到的摩擦力一定大
5、如图所示,弹簧秤的称钩和提环上分别用细绳绕过定滑轮后吊着A、B两个物体且处于静止状态.A和B的质量都是0.5千克,则弹簧秤的读数为( )
A.零 B.0.5N C.4.9N D.无法确定
6、如图所示,重为G的物体P挂在测力计下,其下端的纸带穿过打点计时器.现分别两次拉动物体P竖直向上运动,打出的纸带分别如图(a)、(b)所示,其对应测力计的示数分别为Fa、Fb,则Fa和Fb的大小关系是( ) A.FaFb D. 以上三种情况都有可能
7、下面关于力学现象的解释中,正确的是( )
A.大力士不能凭空把自己举起来,说明力是使物体运动的原因
B.物体在空中自由下落,速度越来越快,说明力是改变物体运动状态的原因
C.汽车上坡,没有向上的推力或拉力,车会向下运动,说明车此时没有惯性
D.球在草地上越滚越慢,说明力的作用效果只能改变物体运动速度的大小
8、.关于静止在水平地面上的汽车,以下说法正确的是 ( )
A.车处于静止状态,它没有惯性
B.车处于静止状态,所受的力是平衡力
C.车处于静止状态,所以不受力的作用
D.车处于静止状态,是因为它只受到摩擦力
9、学习了惯性知识后,小明有了如下认识,其中下列说法正确的是( )
A物体运动时的惯性比静止时的惯性大 B任何物体在任何情况下都有惯性
C地球上的物体都有惯性,在太空行走的宇航员没有惯性 D自由下落的物体没有惯性
10、在匀速行驶的火车上,一位乘客发现自己正上方的车厢顶棚上有一小水滴正要下落,
这滴水下落后,将要( )
A此乘客的座位前面 B此乘客的座位后面 C此乘客的头上 D此乘客的左侧肩膀上
11、如果物体在光滑水平面上做匀速直线运动,并且在水平方向只受两个力作用,错误的是( )
A这两个力一定是一对平衡力 B如果撤去这两个力,物体仍然匀速直线运动
C如果去掉其中一个力,物体将会静止
D若在水平方向再加一个力,物体运动状态将会改变
12、.如图所示,M是放在水平桌面上的物体,两边用细线通过滑轮
与小盘相连.若在左盘中放重为G的砝码、右盘放重为2G的
砝码,物体M恰好以速度v向右匀速直线运动;如果右盘中的
砝码不变,物体M在水平桌面上以2v向左做匀速直线运动,
则左盘中砝码的重应为(小盘重不计,绳子与轮的摩擦不计) ( )
A G B 2G C 3G D 4G
13、一张课桌在水平地面上保持静止的原因是( )
A受到地球对它的施加的重力作用 B受到地面对它的摩擦力的作用
C受到平衡力的作用 D没有受力,因惯性而保持静止状态
14、关于力与运动说法正确的是( )
A物体不受力,运动状态一定不改变
B物体运动状态不变,一定没有受到力的作用
C平衡力作用在物体上,物体的运动状态一定要发生改变
D力是维持物体运动状态不变的原因
15、下列给出了几种事例,其中利用惯性的是( )
①从树上掉下的苹果; ②司机为节省燃油,在汽车进站时,提前关闭油门 ;③锤头松了,把锤柄的一端在物体上撞击几下 ④绕地球做圆周运动的人造卫星;⑤跳远运动员都是跑一段距离才起跳; ⑥公共汽车的乘务员,时常提醒乘客扶住车的扶手,待车停稳后再下车.
A ①②③⑤ B ②③⑤⑥ C ②③⑤ D ③④⑤⑥
16、下列现象中属于利用惯性的是 ( )
A.汽车上的安全带; B.市区内道路旁的限速牌;
C.“客货混装”的禁令 D.跳远运动员起跳前助跑一段距离.
17、有两个鸡蛋,一生一熟,让它们在光滑的水平桌面上以同样的速度同时开始转动
A.生鸡蛋很快停止转动,熟鸡蛋转了一会儿才停止
B.熟鸡蛋很快停止转动,生鸡蛋转了一会儿才停止
C.两个鸡蛋都很快停止转动
D.两个鸡蛋都转了一会儿,然后同时停止
18、如图所示,商场的电梯匀速向上运动,站在电梯上相对电梯静止的人受到的作用力有( )
A.重力和支持力 B.重力、支持力和水平向右的摩擦力
C.重力、支持力和水平向左的摩擦力 D.重力、支持力和斜向上的摩擦力
19.下列事例中,属于避免惯性带来危害的是
A.拍打刚晒过的被子,灰尘脱落
B.锤头松了,将锤柄在地面上撞击几下,锤头就紧套在锤柄上
C.汽车在行驶时要保持一定的车距
D.跳远时,助跑能使运动员跳得更远
20.一个运动着的物体,撤去所有外力后,它将 ( )
A.立即停止 B.运动速度越来越慢
C.运动速度越来越快 D.做匀速直线运动
21.在平直公路上行驶的汽车,下列各对力中一定是平衡力的是 ( )
A.汽车的重力和汽车对地面的压力
B.汽车受到的牵引力和汽车受到的摩擦力
C.汽车受到支持力和汽车对地面的压力
D.汽车受到的支持力和汽车的重力
二、填空题
1.在光滑的水平面上,小华用400N的力拉着一个木箱在水平面上做直线运动,当木箱速度达到3m/s
时,拉着木箱的绳子突然断了,这个木箱在水平面上做 运动,木箱此时的速度为
2.某工地的起重机要吊装一个工件,该工件重1200N.当起重机以2m/s匀速吊着工件上升时,起重机的钢绳受到的拉力为 N;当起重机以5m/s速度匀速吊着工件下降时,钢绳受到的拉力为 N,拉力的方向为 当起重机吊着工件以4m/s的速度沿水平方向做直线运动,工件受到的拉力为 .
3.把一个质量为100g的苹果挂在弹簧测力计的挂钩上,则苹果会受到竖直向上的拉力和重力的作用,弹簧测力计的示数此时应为 ;当手提着弹簧测力计以2m/s速度沿竖直方向匀速下降,则弹簧测力计的示数为 N.
4.人站在公交车上,当汽车突然启动时,人会向 倒,这是因为人的脚和车厢底面的 ,脚的底部随车一起 ,可是人的上半身由于 而保持原来的静止状态,所以人出现上述现象.
5.人们有时要利用惯性,有时要防止惯性带来的危害,请你就以上两点各举1例.(不要求解释) ; .
6.重50N的物体,在水平方向受到12 N的拉力作用,沿水平方向向右做匀速直线运动,则物体此时受到地面的摩擦力为 ,方向 .
7.若一滴雨天下落的雨滴质量为0.01g,在空气中以2m/s的速度匀速下落,则雨滴受到空气的阻力为 N;如果以4m/s速度匀速下落,则空气的阻力将 (填“变大”、“变小”或“不变”).
8.正在上升的氢气球,下端拴一个小装饰物,当升空到某高度时,忽然绳子断裂,装饰物开始时将先 运动,这是由于 缘故.
9.有一架直升飞机重150000N,停在空中时,螺旋桨产生向上的举力,这个力是 N;
当它沿水平方向飞行时,竖直向上的举力是 N,当它匀速下降时,举力将
(填“变大”、“变小”或“不变”).
10.如图,在光滑桌面上,当电风扇工作时,空气会由静止流动起来,这说明力能______ ______ __ _;同时小车将向_____运动,原因是__ __ ;类似的装置可应用在某些交通工具上,试举一例________.这类交通工具在月球上是无法工作的,这是因为:_____________
11.如图,水平传送带正将一袋大米从车间运送到粮仓.重500N的一袋大米静止放到传送带上,米袋先在传送带上滑动,稍后与传送带一起匀速运动,米袋滑动时受到的摩擦力大小是重力的0.5倍.米袋在滑动时受到的摩擦力方向向 (左或右),随传送带一起匀速运动时受到的摩擦力大小为 N. 图6
图6
12.用弹簧测力计沿水平方向拉着一木块在水平木板上做匀速直线运动时,弹簧测力计的示数为12N,此时木块所受的合力为_______N.若将拉力增大,当弹簧测力计的示数为20N时,木块受到的滑动摩擦力的大小为_______N.
图13
13.如图13-甲所示,完全相同的木块A和B叠放在水平桌面上,在12N的水平拉力F1作用下,A.B一起作匀速直线运动,此时木块B所受的摩擦力为______N;若将A.B紧靠着放在水平桌面上,用水平力F2推A使它们一起匀速运动(如图乙所示),则推力F2=_________N.
14.竖直向空中抛出一个小石子,石子离开手后仍继续向上运动的原因是___________;石子在上升过程中,速度越来越小,其原因是___________________.
15.如图所示,在玻璃杯内装满米,将竹筷竖直插入米中,然后用竹筷将玻璃杯沿竖直方向慢慢提起,使玻璃杯在空中处于静止状态.已知玻璃杯与米的总质量是0.8kg,则玻璃杯与米受到的总重力是 N,
与总重力相平衡的力是 力.(g取10N/kg) 新课标第一网
15. 如图1中,通过弹簧秤拉着木块在水平桌面上做匀速直线运动.以 m/s速度拉动时,弹簧秤的示数 N.此时木块受到的摩擦力 2N;若以 cm/s的速度匀速拉动时,弹簧秤的示数 2N,木块受到的摩擦力 2 N.(全部填写“大于”“小于”“等于”)
三、作图题
1.有一个木球在水中上浮,在图11中画出木球竖直方向所受到的力的示意图.
2.在自动化生产线上,常用传送带传送工件,如图12所示,一个工件与传送带一起以O.3m/s的速度水平向右匀速运动,不计空气阻力,请在图中画出工件受力的示意图. .
3.画出草地上向前滚动的足球受到的力
图2
四、实验题xkb1.com
1、在研究牛顿运动定律的实验中如图2所示,小车从同一斜度及同一高度下滑,在不同材料上继续运动,分别停止在图示位置上,则:
(1)使小车从同一高度滑下是为了 .
(2)小车在不同平面上通过的距离不等,表明_____
第22题
(3)由实验可以得到的推论 _________
2、.如图所示,在研究二力平衡条件的实验中,可以把木块放在
(选填“光滑”或“粗糙”)的水平桌面上,向两端的小盘里加砝码,当两盘砝码质量 (选填“相等”或“不相等”)时,木块静止;(2)保持两盘砝码质量相等,把木块扭转一个角度,使拉力F1和F2比不在同一直线上,观察到木块发生转动.当木块重新恢复到原来静止状态时,拉力F1、F2作用在同一直线上.如果 ,方向相反,作用在 上,这两个力就彼此平衡了.
3、质量为3kg的物体被200N的水平力压在竖直的墙壁上不动,则此时物体对墙壁的压力是多大?物体受到墙壁的摩擦力是多大?若将水平压力减小为100N,此时物体刚好匀速下滑,则物体受到的摩擦力为多大?
①___________________________________________________________________________.
②_________________________________;③___________________________________.
4、如图所示,在水平桌面上叠放着长方体木块甲和乙,甲、乙及桌面的接触面都是粗糙的,甲重10N,乙重20N.乙用水平细线拴住,用 的水平力拉乙,使甲、乙同时匀速向右运动,分别说出甲、乙两物体受到哪些力的作用?分别作出甲、乙两物体受力的示意图.
5. 在学习运动和力的关系时,小明和小华提出下面的观点.请你利用身边的物品或实验器材设计一个实验,说明他们的观点是不正确的.
(1)写出你选用的物品或实验器材∶
(2)简述实验方法及实验现象∶1年前查看全部
- 139140258急求翻译,谢谢.赶紧呀
raulcnnn1年前3
-
shino0128 共回答了10个问题
|采纳率90%140528 一世都爱我吧,至于139,我觉得没什么寓意的,
要是强翻得话可以说成 一生一世都爱我吧 省掉一些,谐音一些
自己瞎琢磨的,
你满意就给我说,我在那个上也回答下,不满意就算,也不多费采纳率
时间还早,看你的意思了1年前查看全部
- 急求! 诗句填空 远近_______
一直受伤的男人1年前3
-
超级大房东 共回答了22个问题
|采纳率86.4%远近高低各不同1年前查看全部
- 英语急求 谢谢 选词填空 适当形式 life die careful place among in
英语急求 谢谢 选词填空 适当形式 life die careful place among in
英语急求 谢谢 选词填空 适当形式
life die careful place among invent start become spend poor
fishingbaby1年前1
-
鞠媛 共回答了16个问题
|采纳率100%invented
poor
start
became
spent
carefully
life
among
died
place1年前查看全部
- 小学数学公式大全 急求
默默尘1年前5
-
安静安静安静 共回答了27个问题
|采纳率96.3%1 每份数×份数=总数
总数÷每份数=份数
总数÷份数=每份数
2 1倍数×倍数=几倍数
几倍数÷1倍数=倍数
几倍数÷倍数=1倍数
3 速度×时间=路程
路程÷速度=时间
路程÷时间=速度
4 单价×数量=总价
总价÷单价=数量
总价÷数量=单价
5 工作效率×工作时间=工作总量
工作总量÷工作效率=工作时间
工作总量÷工作时间=工作效率
6 加数+加数=和
和-一个加数=另一个加数
7 被减数-减数=差
被减数-差=减数
差+减数=被减数
8 因数×因数=积
积÷一个因数=另一个因数
9 被除数÷除数=商
被除数÷商=除数
商×除数=被除数
小学数学图形计算公式
1 正方形
C周长 S面积 a边长
周长=边长×4
C=4a
面积=边长×边长
S=a×a
2 正方体
V:体积 a:棱长
表面积=棱长×棱长×6
S表=a×a×6
体积=棱长×棱长×棱长
V=a×a×a
3 长方形
C周长 S面积 a边长
周长=(长+宽)×2
C=2(a+b)
面积=长×宽
S=ab
4 长方体
V:体积 s:面积 a:长 b: 宽 h:高
(1)表面积(长×宽+长×高+宽×高)×2
S=2(ab+ah+bh)
(2)体积=长×宽×高
V=abh
5 三角形
s面积 a底 h高
面积=底×高÷2
s=ah÷2
三角形高=面积 ×2÷底
三角形底=面积 ×2÷高
6 平行四边形
s面积 a底 h高
面积=底×高
s=ah
7 梯形
s面积 a上底 b下底 h高
面积=(上底+下底)×高÷2
s=(a+b)× h÷2
8 圆形
S面积 C周长 ∏ d=直径 r=半径
(1)周长=直径×∏=2×∏×半径
C=∏d=2∏r
(2)面积=半径×半径×∏
9 圆柱体
v:体积 h:高 s;底面积 r:底面半径 c:底面周长
(1)侧面积=底面周长×高
(2)表面积=侧面积+底面积×2
(3)体积=底面积×高
(4)体积=侧面积÷2×半径
10 圆锥体
v:体积 h:高 s;底面积 r:底面半径
体积=底面积×高÷3
总数÷总份数=平均数
和差问题的公式
(和+差)÷2=大数
(和-差)÷2=小数
和倍问题
和÷(倍数-1)=小数
小数×倍数=大数
(或者 和-小数=大数)
差倍问题
差÷(倍数-1)=小数
小数×倍数=大数
(或 小数+差=大数)
植树问题
1 非封闭线路上的植树问题主要可分为以下三种情形:
⑴如果在非封闭线路的两端都要植树,那么:
株数=段数+1=全长÷株距-1
全长=株距×(株数-1)
株距=全长÷(株数-1)
⑵如果在非封闭线路的一端要植树,另一端不要植树,那么:
株数=段数=全长÷株距
全长=株距×株数
株距=全长÷株数
⑶如果在非封闭线路的两端都不要植树,那么:
株数=段数-1=全长÷株距-1
全长=株距×(株数+1)
株距=全长÷(株数+1)
2 封闭线路上的植树问题的数量关系如下
株数=段数=全长÷株距
全长=株距×株数
株距=全长÷株数
盈亏问题
(盈+亏)÷两次分配量之差=参加分配的份数
(大盈-小盈)÷两次分配量之差=参加分配的份数
(大亏-小亏)÷两次分配量之差=参加分配的份数
相遇问题
相遇路程=速度和×相遇时间
相遇时间=相遇路程÷速度和
速度和=相遇路程÷相遇时间
追及问题
追及距离=速度差×追及时间
追及时间=追及距离÷速度差
速度差=追及距离÷追及时间
流水问题
顺流速度=静水速度+水流速度
逆流速度=静水速度-水流速度
静水速度=(顺流速度+逆流速度)÷2
水流速度=(顺流速度-逆流速度)÷2
浓度问题
溶质的重量+溶剂的重量=溶液的重量
溶质的重量÷溶液的重量×100%=浓度
溶液的重量×浓度=溶质的重量
溶质的重量÷浓度=溶液的重量
利润与折扣问题
利润=售出价-成本
利润率=利润÷成本×100%=(售出价÷成本-1)×100%
涨跌金额=本金×涨跌百分比
折扣=实际售价÷原售价×100%(折扣<1)
利息=本金×利率×时间
税后利息=本金×利率×时间×(1-20%)1年前查看全部
- 急求英语电影配音素材
MARS20001年前1
-
谢导 共回答了20个问题
|采纳率95%无演员配音的只有原始母带 ,只有拍摄的电影公司和引进的公司才有
对白声音轨.音乐轨是分开的
电影视频的对白和音乐都是糅合在一起的
无法分开
所以你不可能单独消除声音而保留背景音效
还有种方法是这样的.
任何软件都不能做到完全的去处人声,特别是对欧美专业公司制作的专业唱片,歌声和伴奏都是混排的,所以根本没法处理.
但对于国内一些制作公司制作的唱片或音频文件可以某种程度上作一些处理,但只能由于家庭娱乐,可以用adobe AUDITION处理,也就是 cool edit pro的升级版
方法如下:
到如音频文件,然后“编辑”--“转换采样模式”,在弹出的对话框中选中“channels”(通道)选项中的mono(单声道)将左声道混合比和右声道混合比分别设置为100%和-100%可部分去除人声,这是最好的办法了1年前查看全部
- 英语作文急求Directions:this part is to test your ability to do pra
英语作文急求
Directions:this part is to test your ability to do practical writing.Please write a letter of apology based on the following information giwen in Chinese.
谢绝晚餐邀请
亲爱的凯瑟琳:
非常抱歉,我不能于周日晚上来和你共进晚餐.托尼的妈妈要从广州来看我们,所以那天晚上我们要去火车站接她.
再次感谢你的盛情邀请,祝你周末快乐.
玛丽谨启风铃呓语1年前1
-
skywen32 共回答了19个问题
|采纳率89.5%Dear Kathren:
I am so sorry that I can't have dinner with you on Sunday evening. Tony's mother will come to see us from Guangzhou. So we will go to the train station to pick her up on that day.
Thanks again for inviting me for dinner. Have a nice weekend.
Mary1年前查看全部
- 计算x+1/x除以(x-1+x^2/2x)急求过程
计算x+1/x除以(x-1+x^2/2x)急求过程
好心人帮帮忙吧seekfor1年前1
-
mdmdm1 共回答了13个问题
|采纳率92.3%原式={(x+1)/x}÷{x-(1+x²)/(2x)} = {(x+1)/x}÷{(2x²-1-x²)/2x} = {(x+1)/x}*{2x/(x²-1)}
= {(x+1)/x}*{2x/(x+1)(x-1)} = {1/x}*{2x/(x-1)} = 2/(x-1)1年前查看全部
- 急求翻译Sales Review - the subsidiary's Name & Local currency,Pl
急求翻译Sales Review - the subsidiary's Name & Local currency,Please note the amount is in Thousan
zcb79867921年前1
-
waywaychen1 共回答了15个问题
|采纳率86.7%销售记录
请填写分支机构的名称及当地货币单位,请注意金额以千为单位.
:)
希望可以有所帮助1年前查看全部
- 计算(1/a-b)-(1/a+b)-(2b/a^2+b^2)-(4b^3/a^4+b^4)急求高手解答~
计算(1/a-b)-(1/a+b)-(2b/a^2+b^2)-(4b^3/a^4+b^4)急求高手解答~
计算(1/a-b)-(1/a+b)-(2b/a^2+b^2)-(4b^3/a^4+b^4)急~RockyWoo1年前1
-
一世承诺 共回答了13个问题
|采纳率84.6%原式=2b/(a²-b²))-2b/(a²+b²)-(4b³(a⁴+b⁴)=
=2b2³b/(a⁴-b⁴)-(4b³(a⁴+b⁴)=01年前查看全部
- 急求09英语走向成功答案
羽心化木1年前1
-
orifangxu 共回答了19个问题
|采纳率94.7%不断努力
努力
再努力1年前查看全部
- -2^100+2^99过程,急求
就管你1年前1
-
单身妖精 共回答了22个问题
|采纳率86.4%2^99-2^100=2^99-2^99*x2=(1-2)x2^99= -2^991年前查看全部
- f(x)=-1,lim(x->0)[f(x0-2x)-f(x0+3x)]/2x=5/2急求详细过程
wujunrui81271年前0
-
共回答了个问题
|采纳率
- 急求分析we are informed that not only does the Internet bring us
急求分析we are informed that not only does the Internet bring us convenience,but also separates us from one another.为什么bring不加s separate 加s?
cuiluo19831年前1
-
爱上奕 共回答了18个问题
|采纳率94.4%因为bring 前面有does1年前查看全部
- 计算1-2+3-4+5-6+...+95-96+97急求,谢谢
cyjjh1年前7
-
chenhuwu 共回答了17个问题
|采纳率100%1-2+3-4+5-6+...+95-96+97
=1+(3-2)+(5-4)+(7-6)+……+(95-94)+(97-96)
=1×49
=491年前查看全部
- 急求高手完成完形填空I was surprised when I heard that Philip was only
急求高手完成完形填空
I was surprised when I heard that Philip was only admitted into our program on a conditional basis since he has already studied in our class as a (n) 41) ____________ student. He's also employed on a (n) 42) ____________ basis in the school library as a (n) 43) ____________ librarian. He says that this work takes much of his time although he's only a (n) 44) ____________ employee. He often says that I'm very lucky since I can study 45) ____________ and needn't do any extra work with my fellowship. But he's happy anyway, since this year there's a financial cut in the state economy, and many able people who work for companies are 46) ____________.
A. part-time
B. full-time
C. temporary
D. irregular
E. underemployed
F. regularA. part-time
B. full-time
C. temporary
D. irregular
E. underemployed
F. regular
xilinxuan1年前1
-
tjwangcong 共回答了19个问题
|采纳率94.7%41B
42D
43A
44C
45F
46E1年前查看全部
- 初三英语日记急求!
ec7e1年前1
-
sgdx930 共回答了25个问题
|采纳率88%July 14th Wednesday rainy
Yesterday I came to the shopping center with my mother.We came to a place named “toward the air door”.I think many people know it.The night view is so beautiful that we all don’t want to back to home.I have a photo here.In the nine,we had to go back home.I didn’t wash my face before I went to bed,I’m too tired.
改个日期就行了.1年前查看全部
- 新生入学家长受累英语作文 急求`````
gyp211年前2
-
落叶怎无痕 共回答了18个问题
|采纳率77.8%In order to study well in the high school,I should do some ready.
Firstly, i think i should learn more English words in summer holiday.Because The more English
words
i can use,the more articles i can understand.Secondly,i can chat with foreign friends on the Net.Not only can i make friend with other countries friends ,but also i can improve my English .In fact ,learning English is very intersting.We can find that Enlish culture attracts us so much.GeneIn a word,i will do my best to make good use of internet in my summer holiday1年前查看全部
- 急求英文童谣It's Spring Festival again!
21jianke1年前1
-
ertijiao1969 共回答了21个问题
|采纳率95.2%It is Spring Festival again !
It is Spring Festival again !
All houses look bright,new and clean.
There is a sweet smell of tangerine.
It is Spring Festival again !
At home,families and good friends meet.
There's lots of delicious food to eat.
It is Spring Festival again !
It is a holiday full of love and joy,
A holiday fot everyone to enjoy.1年前查看全部
大家在问
- 1求教高手一道gre填空题.It is no accident that most people find Davis'
- 2无法用语言表达我现在的心情用粤语怎么说?
- 3初一的济南的冬天的行文思路是什么?
- 4“读万卷书,行万里路 知识不仅可以从—— 、——获得,还可以从—— 、——获得.
- 5Now the air in our hometown is even
- 6我心中的红色偶像作文一个人就行。200字.不是比尔·盖茨
- 7在▱ABCD中,AC,BD交于点O,过点O作直线EF,GH,分别交平行四边形的四条边于E,G,F,H四点,连接EG,GF
- 8受命以来 夙夜忧叹中以的意思受命以来中以的意思
- 9我也是,今生遇到你是我最大的快乐,你是上天赐给我最好的礼物翻译成英文
- 10根据首字母填词,使对话完整(九年级英语)
- 11英语翻译文如下:我的名字叫张强.我来自北京市.我今年十一岁.我在阳光小学【Yangguang Primary Schoo
- 12(语文)仿写排比句.洗手的时候,日子从水盆里过去;吃饭的时候,日子从饭碗里过去;默默时,便从凝然的双眼前过去.
- 131.You left your homework at home.怎么办
- 14下列关于化学观或化学研究方法的叙述,错误的是( )
- 15选择合适的成语填空.画蛇添足 张口结舌 自相矛盾 滥竽充数 画龙点睛 口若悬河1.张小明订的计划( ),漏洞百出,大家都