作业帮X2Y2_X2_Y2+4XY+1
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X2Y2_X2_Y2+4XY+1
X2Y2_X2_Y2+4XY+1
X2Y2_X2_Y2+4XY+1
x^2y^2-x^2-y^2+4xy+1
=x^2y^2+2xy+1-x^2-y^2+2xy
=(xy)^2+2xy+1-(x^2+y^2-2xy)
=(xy+1)^2-(x-y)^2
=(xy+1-x+y)(xy+1+x-y)
注意：x^2表示x的平方,依次类推.
x^2y^2-x^2-y^2+4xy+1
=x^2y^2+2xy+1-(x^2-2xy+y^2)
=(xy+1)^2-(x-y)^2
=(xy+x-y+1)(xy-x+y+1)
原式=x^2y^2+2xy+1-(x^2+y^2-2xy)
=(xy+1)^2-(x-y)^2
=(xy+1+x-y)(xy+1-x+y)
X2Y2_X2_Y2+4XY+1
=(x^2y^2+2xy+1)-(x^2-2xy+y^2)
=(xy+1)^2-(x-y)^2
=(xy+1+x-y)(xy+1-x+y)
I don't know
自己上网查吧！不会的问爸妈。
x^2y^2+2xy+1)-(x^2-2xy+y^2)
=(xy+1)^2-(x-y)^2
=(xy+1+x-y)(xy+1-x+y)
X2Y2_X2_Y2+4XY+1
X2Y2_X2_Y2+4XY+1
（1）3xy-4xy-(-2xy)
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已知xx+xy=1,xy-yy=-4,则xx+2xy-yy=