Question

7.34×2.1+7.34×7.8+73.4×0.01怎么简算

Answer 1

问：7.34×2.1+7.34×7.8+73.4×0.01怎么简算

答：这道题的结果是73.4。过程7.34×2.1+7.34×7.8+73.4×0.01=7.34×2.1+7.31×7.8+7.34×10×0.01=7.34×2.1+7.34×7.8+7.34×0.1=7.34×（2.1+7.8+0.1）=7.34×10=73.4

答：首先采用的是乘法的结合律。把73.4变成7.34×10。然后用10×0.01。第2步就是提取公因式。