簡便計算(72×357+357×28)÷(51×7×4)

簡便計算(72×357+357×28)÷(51×7×4)


(72×357+357×28)÷(51×7×4)
=[357×(72+28)]÷(51×7×4)
=357×100÷(51×7×4)
=[357÷(51×7)]×(100÷4)
=1×25
=25



72+28×51-31怎樣簡算
線上等答案、、、thanks


原式=72+28×50+28×1-31=72+1400+28-31=72+28+1400-31=100+1400-31=1500-31=1469