已知|x²-3xy-4y²|+2根号(x²+4xy+4y²-1)=0
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x²-3xy+4x=3,y²+xy-4y+7=0,则xy-1/2(x²+y²
已知X—根号3XY-4Y=0,求(2X+3根号XY-2Y)/(3X-根号XY+Y)的值
已知x²+6y²-4xy-4y+2=0,计算根号x+根号y÷根号3x的值
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x-2y=3,x²-2xy+4y²=11,求下列各值; (1)xy (2)x²-2xy
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
化简求值 已知:(x+2)2;+|y+1|=0求5xy²-{2xy²-[3xy²(4xy&