某培训学校女学员人数与总人数的比是7比12,后来又转来15名女生,这时女生人数与总人数的比是3比5.求这

天变晴朗2022-10-04 11:39:541条回答

某培训学校女学员人数与总人数的比是7比12,后来又转来15名女生,这时女生人数与总人数的比是3比5.求这
个培训学校的总人数.用算术法怎么解答?方程我会了.

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draculadon 共回答了16个问题 | 采纳率100%: 设未转来女生前男生x人,女生y人
x:y=7:12
x:(y+15)=3:5
解方程; 1年前

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16.8/(100%+20%)=14
16.8-14=2.8万
赚2.8万元
16.8/(100%-20%)=21
21-16.8=4.2万
赔4.2万元
4.2大于2.8
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解题思路：（1）知道水的质量、比热容、初温和末温，根据公式Q_吸=cm（t-t₀）可求出水吸收的热量．
（2）知道无烟煤的质量和热值，根据Q_放=mq可求出无烟煤完全燃烧放出的热量．
（3）有水吸收的热量和无烟煤完全燃烧放出的热量，根据η=

Q吸

Q放

可求出锅炉的效率．

（1）水的质量：m=200kg，水的比热容：c=4.2×10³J/（kg•℃），终温：t=100℃，初温：t₀=25℃，
水吸收的热量为：Q_吸=cm（t-t₀）=4.2×10³J/（kg•℃）×200Kg×（100℃-25℃）=6.3×10⁷J．
（2）无烟煤的质量：m_无烟煤=6kg，无烟煤的热值：q=3.4×10⁷J/kg，
无烟煤完全燃烧放出的热量为：
Q_放=m_无烟煤q=6kg×3.4×10⁷J/Kg=2.04×10⁸J．
（3）锅炉的效率为：η=
Q吸
Q放×100%=
6.3×107J
2.04×108J×100%≈30.9%．
答：（1）锅炉内200kg的水吸收的热量是6.3×10⁷J．
（2）6kg无烟煤完全燃烧放出的热量是2.04×10⁸J．
（3）此锅炉的效率是30.9%．

点评：
本题考点：热量的计算；能量利用效率；燃料的热值．

考点点评：本题综合考查了热量的计算以及锅炉的效率，对公式的把握和运用是关键，只要读好题，总体来说本题难度不大．在利用公式时，要注意每个字母表示的物理量及其单位．

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One possible version:
Dear Sir or Madam,
I’m glad to learn part-time tutors are wanted in your training school and I’d like to have a try. I’m a student who is to graduate from high school soon. I do very well in my English lessons, especially in oral and written English. Besides, I’m monitor and often help others with their English. Before going to university, I will have a long holiday, during which I’m determined to do a part-time job like this to make the best of it. What’s more, I can earn some money for my future studies. Last but not least, I can get some valuable social experience. I’m going to work hard at my job and I can also be a head teacher. I hope I will have a chance to co-operate with you.
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点评：
本题考点：容斥原理．

考点点评：此题属于容斥原理习题，求出实际获奖的人数为：12+28-7=33人，是解答此题的关键．

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Dear Editor,
I have joined an English summer camp recently but I am very disappointed because the organiser didn't keep their promise. I had wanted to improve my English by joining in the camp but there were 60 students in a class so we had few chances to practise our English. Besides, the lessons were easy and the topics are out of date ,which couldn't arouse students's interest in English. What's more, there was no lunch at the school so we had to walk thirty minutes to have meals at the nearest restaurant. The school had promised a variety of activities in the advertisement but they actually only organised one badminton match.
In a word, I am very disappointed and dissatisfied with the camp ,so I submit a claim for compensation here. Please help me.
Thank you.
Yours,
Li Hua
我自己写的,仅供参考吧!

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用五六个字来形容培训学校五六个字可以是成语、名言名句、文言文、所有的都可以培训的是员工素质培训、业绩增长培训之类的 绿手套1年前1: yts1 共回答了18个问题 | 采纳率94.4%

学知识树形象从头再来

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分析语病我校是邵逸夫捐资百万美元,跨省办起的三所外语培训学校之一,有自己的教学楼,图书馆,教学设备及教师队伍.句中“教学 分析语病 我校是邵逸夫捐资百万美元,跨省办起的三所外语培训学校之一,有自己的教学楼,图书馆,教学设备及教师队伍. 句中“教学楼”“图书馆”“教学设备”是动词“有”的并列宾语,而且又无层次上的区别,所以三者之间的两个逗号都应改为顿号. 问：并列宾语一定要用顿号吗,“层次上的区别”是什么意思 A1UPPER1年前1: hsllhp111 共回答了13个问题 | 采纳率84.6%

并列宾语用顿号.
层次上的区别指这几个词是相互间独立的,不是相互交错的.

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某培训学校女学员人数与总人数的比是7比12,后来又转来15名女生,这时女生人数与总人数的比是3比5.求这

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