48.9×99怎么简算
48.9×99怎么简算 -
=4890-48.9 = 4841.1
48.9x10.1 =48.9*(10+0.1)=48.9*10+48.9*0.1 =489+4.89 =493.89 (2)5.6x11x12.5 =(0.7*8)*12.5*11 =0.7*12.5*8*12.5*11 =100*11*0.7*12.5 =9625
=4890-48.9 = 4841.1
48.9x10.1 =48.9*(10+0.1)=48.9*10+48.9*0.1 =489+4.89 =493.89 (2)5.6x11x12.5 =(0.7*8)*12.5*11 =0.7*12.5*8*12.5*11 =100*11*0.7*12.5 =9625
只能这样48.9-13.5÷0.45=48.9-1350÷45=18.9
简算：(1)48.9X10.1=48.9x(10+0.1)=48.9x10+48.9x0.1=489+4.89=493.89 (2)5.6x11x12.5=0.7x8x11x12.5=0.7x11x(8x12.5)=7.7x100=770