计算:4a²+3b²-4a²+2ab-4b²

问题描述:

计算:4a²+3b²-4a²+2ab-4b²

4a²+3b²-4a²+2ab-4b²
=4a²-4a²+3b²-4b²+2ab
=-b²+2ab
=2ab-b²