Simultaneously shenmeyisi

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It takes 4 hour for two pipes to simultaneously fill up a sw It takes 4 hour for two pipes to simultaneously fill up a swimming pool,the smaller pipe would take 6 hour longer than the larger pipe.Find the time it would take the larger pipe to fill up the swimming pool. 以上是该数学题,最好有说明,因为我完全不懂 gojlove1年前2: susanst 共回答了17个问题 | 采纳率88.2%

两个管同时灌满一游泳池花4小时,分开的话较小的一个比较大的一个多花刘小时,问大的一个单独灌满游泳池要花几小时?
设为 x 小时,体积为V立方米
则小的花（x+6）小时
大的速率为 V/x 立方米/小时
小的速率为 V/（x+6）立方米/小时
列式：
4×『 V/x + V/（x+6）』= V
（x-1）^2 = 25
得x=6 或 -4（负数舍去）

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英语数学概率题Two cards are drawn simultaneously from a standard pa 英语数学概率题 Two cards are drawn simultaneously from a standard pack of 52 playing cards.Use a tree diagram to find the probablity that: (A)Both are hearts. (B)Just one is a heart sdlfp20001年前1: 552349536 共回答了21个问题 | 采纳率100%

A) Heart Diamond Spade Club
然后每一项下边再把这四个都写出来
然后总共是4x4=16项
n=16
其中两个都是heart的只有一组
所以m=1
概率=1/16
B) Heart Diamond Spade Club
然后每一项下边再把这四个都写出来
然后总共是4x4=16项
n=16
其中有一个heart的有3组,m=3
所以概率=3/16

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If operations are performed simultaneously,the work done sho If operations are performed simultaneously,the work done should always bear the same …… If operations are performed simultaneously,the work done should always bear the same relation to other work performed at the same time on the piece. 海汐爱协1年前3: 菠萝苹果共回答了23个问题 | 采纳率87%

如果同时进行操作（生产/作业）,（那么）同一时期完成的作品之间应该一样.

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