a²-2ab+b²+2a²+2ab-b²合并同类项
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a²-2ab+b²+2a²+2ab-b²合并同类项a²-2ab+b²+2a²+2ab-b²合并同类项a²-2a
a²-2ab+b²+2a²+2ab-b²合并同类项
a²-2ab+b²+2a²+2ab-b²合并同类项
a²-2ab+b²+2a²+2ab-b²合并同类项
a²-2ab+b²+2a²+2ab-b²
=(a²+2a²)+(-2ab+2ab)+(b²-b²)
=3a²
a²-2ab+b²+2a²+2ab-b²=3a²