简便运算 1.5/7×1/4+1/4×2/7 2.100×（1/5+3/20+4/25) 3.1/5×50+50*4/5 4.2/9*8+2/9
简便运算 1.5/7×1/4+1/4×2/7 2.100×（1/5+3/20+4/25) 3.1/5×50+50*4/5 4.2/9*8+2/9
数学人气：347 ℃时间：2020-04-08 05:45:03
优质解答
1.5/7×1/4+1/4×2/7=1/4x(5/7+2/7)=1/4x1=1/42.100×（1/5+3/20+4/25) =100x1/5+100x3/20+100x4/25=20+15+16=513.1/5×50+50*4/5 =50x(1/5+4/5)=50x1=504.2/9*8+2/9=2/9x(8+1)=2/9x9=2
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