已知(4x-y-1)²+根号下x+y-2=0 求4x²y-4xy-xy²
已知(4x-y-1)²+根号下x+y-2=0 求4x²y-4xy-xy²
已知(4x-2y-1)²+根号(xy-2)=0,求4x³y-4x²y²+xy
已知y=根号下(x-4)+根号下(4-x)+3,求代数式(x-y+4xy/x-y)(x+y-4xy/x+y)?
已知X²+Y²+X²Y²-4XY+1=0 求:(X-Y)^2008-(XY)^2
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知2x+y=0,求x-2y/x²+xy*(x²-y²)/x²-4xy+4y
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
已知X—根号3XY-4Y=0,求(2X+3根号XY-2Y)/(3X-根号XY+Y)的值
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy
已知xy为实数,且满足(x+y-根号3)²与根号下(2x-y)互为相反数,求8x²+4y²
已知4x²+9y²-4x-6y+2=0,求1/根号xy