Question

7.2×8.12+0.72×8.8简便方法？

Answer 1

简便方法为：
7.2×8.12+0.72×8.8
=7.2×8.12+0.72×10×0.88
=7.2×8.12+7.2×0.88
=7.2×（8.12+0.88）
=7.2×9
=64.8
所以答案是64.8

Answer 2

首先把0.72x8.8化成7.2x0.88，再提公因式7.2，即原式=7.2x8.12+7.2x0.88=7.2x（8.12+0.88）=7.2x9=7.2x（10-1）=72-7.2=64.8。

Answer 3

可以运用乘法分配律。
7.2×8.12+0.72×8.8
=7.2×8.12+7.2×0.88
=7.2×(8.12+0.88)
=7.2×9
=64.8

Answer 4

7.2X8.12+0.72X8.8
=7.2ⅹ8.12+7.2x0.88
=7.2X(8.12+0.88)(乘法分配律)
=7.2X9
=7.2x10-7.2X1
=72-8+0.8
=64.8

Answer 5

先把算式7.2×8.12+0.72×8.8写成7.2×8.12+7.2×0.88
然后算式=7.2×（8.12+0.88）
最后算式=7.2×9=64.8