四年级数学简便计算之小数加减乘除混合运算

四年级数学简便计算之小数加减乘除混合运算

  • 简介

    5.79×0.99 =5.79×(1-0.01) =5.79×1-5.79×0.01 =5.79-0.0579 =5.7321 1.01×0.86 =(1+0.01)×0.86 =1×0.86+0.01×0.86 =0.86+0.0086 =0.8686 19.8÷0.5-9.8×2 =19.8×2-9.8×2 =(19.8-9.8)×2 =10×2 =20 8.6×0.45+4.5×0.14 =8.6×0.45+0.45×1.4 =(8.6+1.4)×0.45 =10×0.45 =4.5 8.57÷5-3.57÷5 =(8.57-3.57)÷5 =5÷5 =1 5.46×101-5.46 =5.46×(101-1) =5.46×100 =546

四年级数学简便计算之小数加减乘除混合运算