2x²+xy+3y²=0,求x/y=?
2x²-3xy=y²=0(x,y不得o)求x/y+y/x
已知x-3y=0,求(x²-2xy+y²/x-y)-2y的值
2x+y=0,求4x²+2xy(x+y)+y³
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
已知x-3y=0,求2x+y/x²-2xy ×(x-y)的值
已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy
3x+4y=0 x不等于0 求分式2xy+y²/x²-xy
已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y
已知x+y=4.x-y=6.求代数式xy(y²+y)-y²(xy+2x)-3xy的值
已知x/y=3,求(x²+2xy-3xy²)/(x²-xy+y²)
已知X²+Y²+X²Y²-4XY+1=0 求:(X-Y)^2008-(XY)^2
已知(x+3)+丨X-y+10丨=0 ,求5x²y-[2x²y-(3xy-xy²)-3x&