8.4*0.25简算 原式:8.4*0.25
问题描述:
8.4*0.25简算 原式:8.4*0.25
答
8.4×0.25
=(8+0.4)×0.25
=8×0.25+0.4×0.25
=4×0.25×2+0.4×0.25
=1×2+0.1
=2+0.1
=2.1