2x-4y-xy+2y^2ab+ac-b^2-bc4a^2+4ab+b^2-1c^2-a^2-2ab+1x^2-4y^2+12yz-9z^2a^2b^2-c^2+2ab+1c^2-a^2-2ab+b^2
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![2x-4y-xy+2y^2ab+ac-b^2-bc4a^2+4ab+b^2-1c^2-a^2-2ab+1x^2-4y^2+12yz-9z^2a^2b^2-c^2+2ab+1c^2-a^2-2ab+b^2](/uploads/image/z/1990587-3-7.jpg?t=2x-4y-xy%2B2y%5E2ab%2Bac-b%5E2-bc4a%5E2%2B4ab%2Bb%5E2-1c%5E2-a%5E2-2ab%2B1x%5E2-4y%5E2%2B12yz-9z%5E2a%5E2b%5E2-c%5E2%2B2ab%2B1c%5E2-a%5E2-2ab%2Bb%5E2)
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2x-4y-xy+2y^2ab+ac-b^2-bc4a^2+4ab+b^2-1c^2-a^2-2ab+1x^2-4y^2+12yz-9z^2a^2b^2-c^2+2ab+1c^2-a^2-2ab+b^2
2x-4y-xy+2y^2
ab+ac-b^2-bc
4a^2+4ab+b^2-1
c^2-a^2-2ab+1
x^2-4y^2+12yz-9z^2
a^2b^2-c^2+2ab+1
c^2-a^2-2ab+b^2
2x-4y-xy+2y^2ab+ac-b^2-bc4a^2+4ab+b^2-1c^2-a^2-2ab+1x^2-4y^2+12yz-9z^2a^2b^2-c^2+2ab+1c^2-a^2-2ab+b^2
(x+y)(2-y)
(a-b)(b+c)
(2a+b)(2a-b)
4、5题错了
(ab+1+c)(ab+1-c)
这么简单都不会诶