小数乘法混合运算简便方法五道题？

Question

如题所述

Answer 1

1.使用垂直公式计算0396÷12=0756÷036=156×13=018×15=0025×14=306×36=004×012=384×26≈ 576×3=（小数点后一位）715×229075÷33368×025169÷013155÷3937×00161376×08=52×0684×1364×05448×04525×5354×420042×054076×032025×0046252×34108×25012×05×016=48×025=0125×14≈（保留两位小数）25÷07=（保留三位小数）101÷33=（商业循环小数）1075÷125=（乘法检查）325×904=（除法检查计算）2。确定性计算（需简化计算）25×71×4 1612×99＋1612 52×09＋09728×99＋728 43×50×02 64－264×0526×157＋15

Answer 2

①3.69×5.3+4.7×3.69
②5.7×11.36-1.36×5.7
③7.8×9.9+0.78
④5.71×1.1-0.571
⑤3.43×4.54+2.73×6.86

Answer 3

17.9×9.9
=17.9×（10-0.1）
=179-1.79
=177.21
12.5×7.94×0.8
=（12.5×0.8）×7.94
=10×7.94
=79.4
7.4×0.5+7.4÷0.5
=7.4×0.5+7.4×2
=7.4×（0.5+2）
=7.4×2.5=18.5
4.92÷2.4
=2.05
6.8×32+32×3.2
=32×（6.8+3.2）
=32×10
=320
（8.1-5.6）÷0.8+7.75
=2.5÷0.8+7.75
=3.125
=10.875
5.92×2.5
=（6-0.08）×2.5
=6×2.5-0.08×2.5
=15-0.2
=14.8
5.6×（12.5-8.5÷0.85）
=5.6×（12.5-10）
=5.6×2.5
=5.6÷0.4
=14
3.5×[13-（3.12+5.28）]
=3.5×[13-8.4]
=3.5×4.6
=16.1