作业帮(xy-1)^2-(x+y-2xy)(2-x-y)THANKS!
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(xy-1)^2-(x+y-2xy)(2-x-y)THANKS!
(xy-1)^2-(x+y-2xy)(2-x-y)
THANKS!
(xy-1)^2-(x+y-2xy)(2-x-y)THANKS!
原式=(xy-1)^2+[(x+y)-2xy](x+y-2)
=[(xy-1)^2-4xy]+(x+y)^2-2xy(x+y)-2(x+y)
=(xy+1)^2-2(x+y)(xy+1)+(x+y)^2
=(xy+1-x-y)^2
=(x-1)^2*(y-1)^2
.(x+y-2)(x+y-2xy)+(xy-1)^2
x^2-xy/xy-y^2约分
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2x²y-3(2xy-xy)-xy
(-1/3xy)^2•[xy(2x-y)-2x(xy-y^2)]
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已知x+y=1,xy=-2,则x²y+xy²-2xy
因式分解（x+y)(x+y+2xy)+(xy+1)(xy-1)
分解因式(x+y)(x+y+2xy)+(xy+1)(xy-1)
分解因式：(X+Y）*（X+Y+2XY）+（XY+1）*（XY-1）
1-2/x+y=xy,4y+6x=xy.求xy的解?
XY(XY+3)+(XY+4)+4(X+Y+1)-(X+Y+2)
1.（xy-1）^2-(x+y-2xy)(2-x-y)2.(x+y)(x+y+2xy)+(xy-1)(xy+1)
y^3+xy^2+2xy+x^2-1 因式分解
5x^2y/-1/2xy*3xy^2
(-xy^-1)^2*(-xy^-2)^-3/(-x^2y^3)
因式分解xy²-2xy+x+2y-1