若x²-2x+√(y-1/2)=-1,则x²+4xy+4y²=?
若|x-2|+x²+1/4y²-xy=0 x= y=
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
若2x-y=根号2012 则x²-xy+1/4y²
已知实数x,y满足5x²+2y²+1=6xy+4x-2y,则x²-xy+2000y
若x+y=10 xy=-1 则x²+y²=(x+y)²-2xy=
已知X²+Y²+X²Y²-4XY+1=0 求:(X-Y)^2008-(XY)^2
4/X+1/Y=2,XY=-1,求代数式4Y-X/X-2Y/(x+2y-12Y²/x-2y)的值
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
x²+xy/(x-4y)(x+y),其中x=4,y=-1
已知x²-3xy+4x=3,y²+xy-4y+7=0,则xy-1/2(x²+y²
若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )
解方程x²-2xy+y²=9,x²+4xy+4y²+x+2y=2 2x-1/y=