x⁴-2x²y-3y²+8y-4

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x⁴-2x²y-3y²+8y-4

原式=x⁴-2x²y+y²-4y²+8y-4
=(x²-y)²-(2y-2)²
=(x²-y-2y+2)(x²-y+2y-2)
=(x²-y+2)(x²+y-2)