2(a+b)+3a(a+b)=()(a+b)-(x-y)的平方-(x-y)=-(x-y)()ab-ac+b-c3a-9b+2ac-6bc
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![2(a+b)+3a(a+b)=()(a+b)-(x-y)的平方-(x-y)=-(x-y)()ab-ac+b-c3a-9b+2ac-6bc](/uploads/image/z/2512693-37-3.jpg?t=2%28a%2Bb%29%2B3a%28a%2Bb%29%3D%28%29%28a%2Bb%EF%BC%89-%EF%BC%88x-y%29%E7%9A%84%E5%B9%B3%E6%96%B9-%28x-y%29%3D-%28x-y%29%28%29ab-ac%2Bb-c3a-9b%2B2ac-6bc)
2(a+b)+3a(a+b)=()(a+b)-(x-y)的平方-(x-y)=-(x-y)()ab-ac+b-c3a-9b+2ac-6bc
2(a+b)+3a(a+b)=()(a+b)
-(x-y)的平方-(x-y)=-(x-y)()
ab-ac+b-c
3a-9b+2ac-6bc
2(a+b)+3a(a+b)=()(a+b)-(x-y)的平方-(x-y)=-(x-y)()ab-ac+b-c3a-9b+2ac-6bc
2+3a
(a+1)(b-c)
(a-3b)(3+2c)