简便运算:72×28+28×27+28
问题描述:
简便运算:72×28+28×27+28
答
等于(72+27+1)x28=2800
答
=28*(72+27+1)=2800
答
提取28.得到28乘100等于2800
答
2968
答
整理得:
=28×72+28×27+28×1
=(72+27+1)×28
=100×28
=2800
答
(72+27+1)*28
答
72×28+28×27+28
=(72+27+1)×28
=100×28
=2800