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25×16 7×7 8×3 5等于多少(简便算法)?(简便16/7*8/3*14/5=)

25×16 7×7 8×3 5等于多少(简便算法)?(简便16/7*8/3*14/5=)

简便16/7*8/3*14/5=

16/7*8/3*14/5=

=(16*8*14)/(7*3*5)——先约分比较简便

=256/15

=17又1/15

25乘七分之十六乘八分之七等于多少乘扩号多少乘多少扩号

答:25*16/7*7/8=(50)*(8/7*7/8)

8/25*2/7+8/25*3/7+17/25*5/7=()(用简便方法计算)

8/25*2/7+8/25*3/7+17/25*5/7

=8/25x(2/7+3/7)+17/25x5/7

=8/25x5/7+17/25x5/7

=5/7x(8/25+17/25)

=5/7x1

=5/7

3/7乘8/5+16/7乘2/5(简便计算计算)

3/7乘8/5+16/7乘2/5

=12/7×2/5+16/7×2/5

=(12/7+16/7)×2/5

=4×2/5

=8/5