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](/uploads/image/z/2587243-67-3.jpg?t=a%26%23178%3B-2ab%2Bb%26%23178%3B%2B2a%26%23178%3B%2B2ab-b%26%23178%3B%E5%90%88%E5%B9%B6%E5%90%8C%E7%B1%BB%E9%A1%B9)
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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
a²-2ab+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