因式分解(会几道做几道)y^2+(a^2+b^2)y+a^2b^2abx^2-(ac-b^2)x-bc6x^2+31x-1053x^4-7x^2y^2-20y^46a^4n+k-a^2n+k-35a^k1\3x^3-5\3x^2-8xx(x-1)(x+1)(x+2)-24(x+1)(x+2)(x+3)(x+4)-24

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