化简(a+b)²+(a-b)(2a+b)-3a²
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化简(a+b)²+(a-b)(2a+b)-3a²
化简(a+b)²+(a-b)(2a+b)-3a²
化简(a+b)²+(a-b)(2a+b)-3a²
(a+b)²+(a-b)(2a+b)-3a²
=a^2+2ab+b^2+2a^2-ab-b^2-3a^2
=ab
(a+b)²+(a-b)(2a+b)-3a²
=a²+2ab+b²+2a²+ab-2ab-b²-3a²
=ab