数学第七8.9题
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x³-x²-16x+16
=x(x²-16)-(x²-16)
=(x²-16)(x-1)
=(x-4)(x+4)(x-1)
1+2xy-x²-y²
=1-(x-y)²
=(1-x+y)(1+x-y)
15x²y-30xy²+4x-8y
=15xy(x-2y)+4(x-2y)
=(x-2y)(15xy+4)
=x(x²-16)-(x²-16)
=(x²-16)(x-1)
=(x-4)(x+4)(x-1)
1+2xy-x²-y²
=1-(x-y)²
=(1-x+y)(1+x-y)
15x²y-30xy²+4x-8y
=15xy(x-2y)+4(x-2y)
=(x-2y)(15xy+4)
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