几道因式分解题,能答几题是几题,急⋯⋯1,(x+2)(x+3)(x+4)(x+6)-42x^22,16(x-1)(2x-1)(3x+1)(6x-1)+253,(x^2-1)(9x^2-6x-8)-634,x^2+xy-2y^2+7x+5y+125,a^3+(1-b)a^2-2ba+b^26,x^3+xy+3x+x^2y+x^2+y^2+4y+37,a^2b+a^2c+ac^2-ab^2-b^2c-bc^2
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