爱上海后花园

因式分解下列各式:(1) xy^2+3xy-10x-y^2+4y-4 (2) (x+2)(x+3)(x-4)(x-5)-44

1x^23x10x^244=x^2210^244=x522^2=x5x222x2x3x4x544=x2x4x3x544=x^22x8x^22x1544=x^22x^223x^22x12044=x^22x...

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