因式分解:(1-x²)(1-y²)+4xy
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因式分解:(1-x²)(1-y²)+4xy
因式分解:(1-x²)(1-y²)+4xy
因式分解:(1-x²)(1-y²)+4xy
(1-x²)(1-y²)+4xy
=x²y²+2xy+1-x²-y²+2xy
=(xy+1)^2-(x-y)^2
=(xy+1+x-y)(xy+1-x+y)
1-y²-x²+x²y²+4XY
=1-X²Y²+2XY-(X²-2XY+Y²)
=1-XY(XY+2)-(X-Y)²
=(1+X-Y)(1-X+Y)-XY(XY+2)
解由(1-x²)(1-y²)+4xy
=x^2y^2-x^2-y^2+1+4xy
=x^2y^2+2xy+1-(x^2-2xy+y^2)
=(xy+1)^2-(x-y)^2
=[(xy+1)+(x-y)][(xy+1)-(x-y)]
=(xy+x-y+1)(xy-x+y+1)