13x13-12=?(13-2)x6=?3+13+13x4 用简便写法

分类: 作业答案 • 2022-02-06 15:52:31

问题描述：

答

13x13-12
=13×（10+2+1）-12
=13×10+13×2+13-12
=130+26+1
=157
(13-2)x6
=（10+1）×6
=60+6
=66
3+13+13x4
=13×（1+4）+3
=65+3
=68