12分之7乘(7分之6加28分之3)简便计算
人气：308 ℃ 时间：2019-12-19 04:26:37
解答
12分之7乘(7分之6加28分之3)
=7/12*(6/7+ 3/28)
=7/12*6/7+ 7/12*3/28
=1/2+1/16
=9/16
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