Question

0.83x0.42+11.7x0.042简便计算？

Answer 1

解:

原式

=0.83x0.42+1.17x0.42

=(0.83+1.17)x0.42

=2x0.42

=0.84

方法:

构造后利用乘法分配律实现简便计算。

Answer 2

0.83 × 0.42 + 11.7 × 0.042
= 8.3 × 0.042 + 11.7 × 0.042
=（8.3+11.7）× 0.042
= 20 × 0.042
= 0.84

Answer 3

回答：
0.83×0.42+11.7×0.042
=0.83×0.42+1.17×0.42
=0.42×（0.83+1.17）
=0.42×2
=0.84
运用了乘法分配律

Answer 4

0.83×0.42+1.17×0.42
＝0.42×（0.83+1.17）
＝0.42×2
＝0.84

Answer 5

8.3×0.042+11.7×0.042＝(8.3+11.7)×0.042＝20×0.042＝0.84