(2/15+3/4+5/12)乘60简便运算 5/27乘(1/4+1/5)简便运算 7/4乘17-

问题描述:

(2/15+3/4+5/12)乘60简便运算 5/27乘(1/4+1/5)简便运算 7/4乘17-
(2/15+3/4+5/12)乘60简便运算
5/27乘(1/4+1/5)简便运算
7/4乘17-3/4
1个回答 分类:数学 2014-11-04

问题解答:

我来补答
(2/15+3/4+5/12)乘60
=2/15乘60+3/4乘60+5/12乘60
=8+45+25
=68
5/27乘(1/4+1/5)
=5/27乘1/4+5/27乘1/5
=5/108+1/27
=5/108+4/108
=9/108
=1/12
7/4乘17-3/4
=(1/4)(7×17-3)
=(1/4)×116
=29
 
 
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