五年级上册数学 《简便计算》数学练习题

五年级上册数学 《简便计算》数学练习题


简介:
0.32×403 =0.32×(400+3) =0.32×400+0.32×3 =128+0.96 =128.96 0.85×9.9 =0.85×(10-0.1) =0.85×10-0.85×0.1 =8.5-0.085 =8.415 7.2×0.2+2.4×1.4 =2.4×(3×0.2)+2.4×1.4 =2.4×(0.6+1.4) =2.4×2 =4.8 8.9×1.01 =8.9×(1+0.01) =8.9×1+8.9×0.01 =8.9+0.089 =8.989