Question

6.28×6.29+0.31×62.8的简便方法？

Answer 1

6.28×6.29+0.31×62.8
＝6.28×6.29十3.1x6.28
＝6.28x（6.29十3.1）
＝6.28x9.39
二6.28x（10一0.6一0.1）
＝6.28x10一6.28x0.6一6.28x0.1
＝62.8一3.768一0.628
＝59.032一0.628
＝58.404

Answer 2

6.28×6.29+0.31×62.8=6.28×6.29+3.1×6.28=6.28×(6.29+3.1)=6.28×9.39=58.9692。采用的是乘法分配率的逆运算，最终结果为58.9692。

Answer 3

6.28×6.29+0.31×62.8的简便方法是6.28×6.29+3.1×6.28=6.28×(6.29+3.1)=6.28×9.39=58.9692

Answer 4

原式=6.28*6.29+0.31*(6.28*10)
=6.28*6.29+6.28*3.1
=6.28*(6.29+3.1)
=6.28*9.39
=58.9692