已知4x²+9y²-4x-6y+2=0,求1/根号xy
已知4x²+9y²-4x-6y+2=0,求1/根号xy
已知x>0,y>0,x+根号xy-6y=0,求4x+5根号xy-6y分之x+2根号xy
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2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
已知X²+Y²+X²Y²-4XY+1=0 求:(X-Y)^2008-(XY)^2
已知2x-3根号xy-2y=0(x>0),求x^2+4xy-16y^2/x^2+xy-9y^2
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知xy为实数,且y=根号4-x²+根号x²-4-1除以x+2,求根号3x+4y的值
已知x=5分之2,y=5分之8,求(x+根号xy)分之(根号x-根号y)²+4根号xy的值
已知X—根号3XY-4Y=0,求(2X+3根号XY-2Y)/(3X-根号XY+Y)的值
已知4x2+9y-4x-6y+2=0 求根号y/根号x+根号y - 根号y/根号x-根号y