小数乘法简便运算50道带答案

Question

如题所述

Answer 1

1. 2.64×1.7-2.64×0.7 = 2.64×(1.7-0.7) = 2.64×1 = 2.64
2. 31.5×1.07-3.15×0.7 = 3.15×10.7-3.15×0.7 = 3.15×(10.7-0.7) = 3.15×10 = 31.5
3. 2.7×5.7-2.7+5.3×2.7 = 2.7×(5.7-1+5.3) = 2.7×10 = 27
4. 0.625÷0.125×0.8 = (0.625×0.8)×8÷(0.125×8) = 0.5×8÷1 = 4
5. 18.6×6.1+3.9×18.6 = 18.6×(6.1+3.9) = 18.6×10 = 186
6. 1.3579+3.5791+5.7913+7.9135+9.1357 = (1+3+5+7+9)×1.1111 = 25×1.1111 = 27.7775
7. 52.5×2.9+5.45 = 5.25×29+5.25+0.2 = 5.25×(29+1)+0.2 = 5.25×30+0.2 = 157.5+0.3 = 157.7
8. 0.92×15+0.08×15 = (0.92+0.08)×15 = 1×15 = 15
9. 0.72×1.25×2.5 = 0.9×(0.8×1.25)×2.5 = 0.9×1×2.5 = 2.25
10. 400.6×7-2003×0.4 = 200.3×14-200.3×4 = 200.3×(14-4) = 200.3×10 = 2003
以上是部分小数乘法简便运算的题目及答案，每个条目一段，条目之间换行，保持内容的清晰和条理性。