5.6×70×0.9 简便方法
问题描述:
5.6×70×0.9 简便方法
答
5.6×70×0.9
=5.6×70×(1-0.1)
=8*7*7*(1-0.1)
=8*(50-1)*(1-0.1)
=400-8 -40 + 0.8
=352.8