(4x-2y-1)²+√xy-2=0,求4x²y-4x²y²+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
2x+y=0,求4x²+2xy(x+y)+y³
已知2x+y=0,求x-2y/x²+xy*(x²-y²)/x²-4xy+4y
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
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
(4x-2y-1)²+√xy-2=0,求4x²y-4x²y²+xy²
已知x²+y²-4x-2y+5=0,求代数式[(√x-√y)²+4√xy]/(x+√xy)
已知:x²+y²-4x-2y+5=0,求x+√xy分之(√x-√y)²+4√xy的值.
|x+2|+(y-1/4)²=0,求2(x²y+xy)-3(x²y-xy)-4x²
已知2x+y=0,求x-2y/x²+xy乘(x²-y²)÷x²-4xy+4y