270025用二种巧算方式
270025用二种巧算方式 -
270025用二种巧算方式2700÷25 =27*100÷25 =27*2 =54
27×25 =（28-1）×25 =28×25-1×25 =7×4×25-25 =7×100-25 =700-25 =675
270025用二种巧算方式2700÷25 =27*100÷25 =27*2 =54
27×25 =（28-1）×25 =28×25-1×25 =7×4×25-25 =7×100-25 =700-25 =675
=（2700×4）÷（25×4）11200÷100 =112