a²-2ab+b²+2a²+2ab-b²合并同类项

问题描述:

a²-2ab+b²+2a²+2ab-b²合并同类项

a²-2ab+b²+2a²+2ab-b²=3a²

a²-2ab+b²+2a²+2ab-b²
=(a²+2a²)+(-2ab+2ab)+(b²-b²)
=3a²