2xy-xx-yy+1的因式分解
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2xy-xx-yy+1的因式分解2xy-xx-yy+1的因式分解2xy-xx-yy+1的因式分解2xy-xx-yy+1=1-(x-y)^2=(1-x+y)(1+x-y)2xy-xx-yy+1=1-(x
2xy-xx-yy+1的因式分解
2xy-xx-yy+1的因式分解
2xy-xx-yy+1的因式分解
2xy-xx-yy+1
=1-(x-y)^2
=(1-x+y)(1+x-y)
2xy-xx-yy+1
=1-(x^2-2xy+y^2)
=1-(x-y)^2
=(1+x-y)(1-x+y)
-(X-Y-1)(X-Y 1)
-(X-Y-1)*(X-Y+1)
-(x-y)*(x-y)+1
=-(x-y+1)*(x-y-1)
1-(x-y)^2
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