单项式3ab,2ab,-3ab,-4ab,3ab的和为 ______.

分类: 作业答案 • 2021-12-03 14:05:47

问题描述：

单项式3ab,2ab,-3ab,-4ab,3ab的和为 ______.
单项式3ab,2ab,-3ab,-4ab,3ab的和为 ______.

答

3ab+2ab+(-3ab)+(-4ab)+3ab =(3ab-4ab)+(2ab+3ab)-3ab =-ab+5ab-3ab