23.5x2.8+2.35x72怎么用简便算法?解:原式=23.5x2.8+23.5x7.2=23.5x(2.8+7.2)=23.5x10=235
235
23.5x2.8+2.35x72=2.35x28+2.35x72=2.35x(28+72)=2.35x100=235
23.5×2.8+2.35×72=2.35×28+2.35×72=2.35×(28+72)=2.35×100=235
72还是7.2??