3.单项式-4ab 3ab -b²的和是____________________.

3.单项式-4ab 3ab -b²的和是____________________.
3.单项式-4ab 3ab -b²的和是____________________.

3.单项式-4ab 3ab -b²的和是____________________.
-ab-b²

-4ab+ 3ab -b²的和
=-ab-b²

-4ab+(3ab-b²)=-ab-b²

答案是-2b-b的平方，有什么问题 可以继续问我 呵呵