x²-xy-3x=0,x²+y+1=0
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
解方程x²-xy-3x=0,x²+y+1=0
已知x²-3xy+4x=3,y²+xy-4y+7=0,则xy-1/2(x²+y²
已知X²+Y²+X²Y²-4XY+1=0 求:(X-Y)^2008-(XY)^2
2x²-3xy=y²=0(x,y不得o)求x/y+y/x
已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y
|x+2|+(y-1/4)²=0,求2(x²y+xy)-3(x²y-xy)-4x²
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
x>1,y>0,且满足xy=x^y,x/y=x^3y,求x+y
有理数x,y满足|x+y-3|+(x-y+1)²=0,求(xy²)²X(x²y)
若|x-2|+x²+1/4y²-xy=0 x= y=
已知x,y满足x²+y²-4x-6y+13=0,求(- y/x^3)^3÷(- 1/xy)^4.(x