设x年后母子年龄比为5:2 有
（28+x)/(4+x)=5/2
3x=36
x=12
今年妈妈与儿子的年龄比是7:1,妈妈今年28岁,再过多少年母子俩的年龄比是5:
今年妈妈与儿子的年龄比是7:1,妈妈今年28岁,再过多少年母子俩的年龄比是5:
数学人气：233 ℃时间：2020-03-25 00:40:37
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