(1-x²)(1-y²)-4xy 因式分解(1-x²)(1-y²)-4xy（2x²-3x+1）²-22x+33x-1

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(1-x²)(1-y²)-4xy 因式分解(1-x²)(1-y²)-4xy（2x²-3x+1）²-22x+33x-1
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(1-x²)(1-y²)-4xy 因式分解(1-x²)(1-y²)-4xy（2x²-3x+1）²-22x+33x-1
(1-x²)(1-y²)-4xy 因式分解
(1-x²)(1-y²)-4xy
（2x²-3x+1）²-22x+33x-1

(1-x²)(1-y²)-4xy 因式分解(1-x²)(1-y²)-4xy（2x²-3x+1）²-22x+33x-1
(1-x²)(1-y²)-4xy
=1-x²-y²+x²y²-2xy-2xy
=1-2xy+x²y²-x²-y²-2xy
=(1-xy)²-(x+y)²
=(1-xy+x+y)(1-xy-x-y)
(2x²-3x+1)²-22x+33x-1
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