Question

7.2×8.12+0.72×8.8简便方法？

Answer 1

可以套用结合律：
（a+b）×c＝a×b+c×d;
7.2×8.12+0.72×8.8
＝7.2×8.12+7.2×0.1×8.8
＝7.2×（8.12+0.88）
＝7.2×9
＝64.8.

Answer 2

7.2×8.12+0.72×8.8
＝0.72×10×8.12+0.72×8.8
＝0.72×(10×8.12+8.8)
＝0.72×(81.2+8.8)
＝0.72×90
＝0.72×(100-10)
＝0.72×100-0.72×10
＝72-7.2
＝64.8

Answer 3

7.2×8.12＋0.72×8.8简便计算：
7.2×8.12＋0.72×8.8
＝7.2×8.12＋7.2×0.1×8.8
＝7.2×（8.12＋0.88）
＝7.2×9
＝64.8
7.2×8.12＋0.72×8.8＝64.8。

Answer 4

这道题的简便算法可以从如下这样入手
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 5

可以这样简便计算，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，简便计算完毕。