已知(x+y)²-2x-2y+1=0,求2x²+4xy+2y²
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知X²+Y²+X²Y²-4XY+1=0 求:(X-Y)^2008-(XY)^2
已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y
已知2x+y=0,求x-2y/x²+xy*(x²-y²)/x²-4xy+4y
已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
已知2x+y=0,求x-2y/x²+xy乘(x²-y²)÷x²-4xy+4y
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知2x-y=10,求式子[(x^2+y^2)-(x-y)^2+2y(x-y)]/4y (4xy-2y²)/4
已知(4x-2y-1)²+根号(xy-2)=0,求4x³y-4x²y²+xy
已知(4x-y-1)²+根号下x+y-2=0 求4x²y-4xy-xy²
已知x+y=2,xy=1/2,求x³y+2x²y²+xy³