x⁴-2x²y-3y²+8y-4
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x⁴-2x²y-3y²+8y-4x⁴-2x²y-3y²+8y-4x⁴-2x²y-3y²+8y-4原式=x
x⁴-2x²y-3y²+8y-4
x⁴-2x²y-3y²+8y-4
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）