4322乘1233减4321乘1234怎么简算

分类: 作业答案 • 2021-12-31 22:42:20

问题描述：

答

4322×1233-4321×1234
=(4321+1)×1233-4321×(1233+1)
=4321×1233+1×1233-4321×1233-4321×1
=1233-4321
=-3088