(xy-1)^2+(x+y-2xy)(x+y-2) 因式分解,用换元法做,设t
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(xy-1)^2+(x+y-2xy)(x+y-2)因式分解,用换元法做,设t(xy-1)^2+(x+y-2xy)(x+y-2)因式分解,用换元法做,设t(xy-1)^2+(x+y-2xy)(x+y-2
(xy-1)^2+(x+y-2xy)(x+y-2) 因式分解,用换元法做,设t
(xy-1)^2+(x+y-2xy)(x+y-2) 因式分解,用换元法做,设t
(xy-1)^2+(x+y-2xy)(x+y-2) 因式分解,用换元法做,设t
设xy=m,x+y=n
原式=(m-1)^2+(n-2m)(n-2)
=m^2-2m+1+n^2-(2+2m)n+4m
=(m-n)^2+2(m-n)
=(m-n)(m-n+2)
=(xy-x-y)(xy-x-y+2)
分解因式:(X+Y)*(X+Y+2XY)+(XY+1)*(XY-1)
1.(xy-1)^2-(x+y-2xy)(2-x-y)2.(x+y)(x+y+2xy)+(xy-1)(xy+1)
5xy^2-{2x^y-[3xy^2-(xy^2-2x^2y)]/(-1/2xy)}
化简!1、(x^2-xy)+xy+y^2 2、3(x^2-xy)-xy+y^2
(xy-x²)÷(x²-2xy+y²/xy)×(x-y/x²)
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
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3xy(x²-1)-2x²(1/2xy+y/x)
x²-y²+5x+3y+4(x+y-2xy)(x+y-z)+(xy-1)²