看谁算得又对又快.42÷3= 36×2= 84÷3= 96÷6=98÷49= 360÷12= 15×5= 17×4=66÷22= 21×7= 104÷4= 25×4=
用简便方法计算①4×9×25 ②139×5×2 ③(40+8)×5 ④45×98+55×98.
怎样简便就怎样算.58×99+58 101×88 125×32×25117+48+52+83 88×125 336﹣156﹣144.
用简便方法计算:(要写计算过程.)①25×125×8×40 ②52×66+33×52+52 ③37×99 ④45×101.
用简便方法计算.1.25×3.2×0.8 14.5×102 4.38÷0.125÷0.8 6.4×4.5+3.6×4.5.
怎样算简便就怎样算5.5×17.3+6.7×5.5 4×3.09×0.25 9.07﹣22.78÷3.4.