五上数学期中专练:小数乘除简便计算

五上数学期中专练:小数乘除简便计算


简介:
1.7×4.7+4.7+4.3×4.7 =4.7×(1.7+1+4.3) =4.7×(2.7+4.3) =4.7×7 =32.9 0.027+9.9×0.27 =0.1×0.27+9.9×0.27 =(0.1+9.9)×0.27 =10×0.27 =2.7 3.6×2.5+7.5×3.6 =3.6×(2.5+7.5) =3.6×10 =36 0.25×0.125×4×8 =(0.25×4)×(0.125×8) =1×1 =1 4.2×6.8+3.2×4.2 =4.2×(6.8+3.2) =4.2×10 =42 17.4÷0.25÷4 =17.4÷(0.25×4) =17.4÷1 =17.4