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小学平均数应用题

2024-12-01 18:54:27

推荐回答（6个）

回答1：

解：设第一组数个数为X，第二组数的个数为Y，则总数是X+Y
12.8x+10.2y=12.02（X+Y）
0.78x=1.82y
x:y=7:3
够详细吧！呵呵

回答2：

7:3
o(∩_∩)o...

回答3：

第一组数平均与总平均数相差0.78，第二组平均数与总平均数相差1.82
最后就是0.78x=1.82y（反比例）。
所以x:y=1.82:0.78=7:3

正确结果是7：3

回答4：

设第一组个数为X；第二组个数为Y
(12.8X+10.2Y)/(X+Y)=12.02
移项后得
X/Y=(12.02-10.2)/(12.8-12.02)

回答5：

91：39
貌似我也米算错。。。怎么跟别人答案差那么多。。。

回答6：

7:3

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