Question

7.816×1.45十3.14×2.184+1.69×7. 816简便计算的分析？

Answer 1

解：简便计算，分析上式有提取因式的条件。首先提取7.816进行运算，结果又可提取因式的条件，再提取3.14进行运算就更简便多了。
7.816X1.45+3.14X2.184+1.69X7.816=7.816X(1.45+1.69)+3.14X2.184=7.816X3.14+3.14X2.184=3.14X(7.816+2.184)=3.14X10=31.4

Answer 2

7.816×1.45+3.14×2.184+1.69×7.516

Answer 3

两次运用乘法的分配律进行简便计算，具体步骤如下
=7.816*1.45+7.816*1.69+3.14*2.184
=7.816*（1.45+1.69）+3.14*2.184
=7.816*3.14+3.14*2.184
=3.14*（7.816+2.184）
=3.14*10
=31.4

Answer 4

利用乘法分配律就可以了、用两次
原式= 7.816x1.45+1.69x7.816+3.14x2.184
= 7.816x（1.45+1.69）+3.14x2.184
= 7.816x3.14+3.14x2.184
= 3.14x（7.816+2.184）
= 3.14x10
= 31.4

Answer 5

7.816×1.45+（1.45+1.69）×2.184+1.69×7.816＝（7.816+2.184）×1.45+（2.184+7.816）×1.69=10×1.45+10×1.69=14.5+16.9=31.4