五年级数学・小数乘法简便运算 专项练习

五年级数学・小数乘法简便运算 专项练习

  • 简介

    一、拆加型 3.5×10.2 =3.5×(10+0.2) =3.5×10+3.5×0.2 =35+0.7 =35.7 2.4×10.1 =2.4×(10+0.1) =2.4×10+2.4×0.1 =24+0.24 =24.24 二、拆减型 3.5×9.8 =3.5×(10−0.2) =3.5×10−3.5×0.2 =35−0.7 =34.3 5.2×9.9 =5.2×(10−0.1) =5.2×10−5.2×0.1 =52−0.52 =51.48 三、顺展型 2.5×(4+0.8) =2.5×4+2.5×0.8 =10+2 =12 1.25×(8+0.8) =1.25×8+1.25×0.8 =10+1 =11

五年级数学・小数乘法简便运算 专项练习