五上数学.小数乘除法简便计算 分类练习题

五上数学.小数乘除法简便计算 分类练习题

  • 简介

    第一种:乘法交换律 2.5×9×4 =2.5×4×9 =10×9 =90 1.5×7×6 =1.5×6×7 =9×7 =63 0.8×1.4×12.5 =0.8×12.5×1.4 =10×1.4 =14 0.25×0.46×40 =0.25×40×0.46 =10×0.46 =4.6 0.5×0.34×6 =0.5×6×0.34 =3×0.34 =1.02 0.25×6.14×0.4 =0.25×0.4×6.14 =0.1×6.14 =0.614 第二种:乘法结合律 4.31×1.25×0.8 =4.31×(1.25×0.8) =4.31×1 =4.31 0.79×5×2 =0.79×(5×2) =0.79×10 =7.9 0.16×2.5×400 =0.16×(2.5×400) =0.16×1000 =160 2.5×50×0.6×0.4 =(2.5×0.4)×(50×0.6) =1×30 =30 12.5×32×2.5 =12.5×(8×4)×2.5 =(12.5×8)×(4×2.5) =100×10=1000

五上数学.小数乘除法简便计算 分类练习题