2a²﹙a+b﹚²-18﹙a+b﹚²
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![2a²﹙a+b﹚²-18﹙a+b﹚²](/uploads/image/z/3952796-68-6.jpg?t=2a%26%23178%3B%EF%B9%99a%2Bb%EF%B9%9A%26%23178%3B-18%EF%B9%99a%2Bb%EF%B9%9A%26%23178%3B)
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2a²﹙a+b﹚²-18﹙a+b﹚²
2a²﹙a+b﹚²-18﹙a+b﹚²
2a²﹙a+b﹚²-18﹙a+b﹚²
2a²﹙a+b﹚²-18﹙a+b﹚²
=2(a+b)²(a²-9)
=2(a+b)²(a+3)(a-3)
2a²﹙a+b﹚²-18﹙a+b﹚²
提取(a+b)^2
则=(a+b)^2(2a^2-18)
=2(a+b)^2(a+3)(a-3)