因式分解(有理数范围内)1.x⁴-12.x²+4x-xy-2y+43.4x²-12x+54.21x²-31x-225.4x²+4xy+y²-4x-2y-36.9x^5-35x³-4x7.3x²-6x8.49x²-259.6x²-13x+510.x²+2-3x11.12x²-23x-2412.(x+6)(x-6)-(x-6)13.

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