1.25×0.9-0.125的简便运法
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1.25×0.9-0.125
=1.25×0.9-1.25×0.1
=1.25×(0.9-0.1)
=1.25×0.8
=1
咨询记录 · 回答于2022-04-23
1.25×0.9-0.125的简便运法
1.25×0.9-0.125=1.25×0.9-1.25×0.1=1.25×(0.9-0.1)=1.25×0.8=1
[比心]亲,用乘法分配律可以简便计算
3.2×2.5×0.0125=0.4×2.5×8×0.0125=1×0.1=0.1
77X199+75
77X199+75=77×199+77-2=77×(199+1)-2=77×200-2=15400-2=15398
亲,是这个哦[比心]
4-0.4-0.04×25=4-0.4-1=4-1-0.4=3-0.4=2.6
948—7.95+0.52简便方法计算
948-7.95+0.52=948-8+0.52+0.05=940+0.52+0.05=940.57
谢谢老师