5x²-6xy-8y²=0,则y/x+x/y=?
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
若方程 ;x²-5xy+6y²=0,则x/y=
已知x²-5xy+6y²=0,则y比x等于
已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy
已知x-y=3xy,且xy不等于0,则-3x+6xy+3y/(7x-5y)-9xy-(3x-y)
已知x-5y=0,求分式x²-2xy+y²/3x+y × (y-x)的值
x²-6y²=﹣xy 且x>0,y>0 求分式x+3y/x-y的值
已知x的平方+y的平方-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知实数x,y满足5x²+2y²+1=6xy+4x-2y,则x²-xy+2000y
已知:(x+2)²+|x+y-10|=0,求3x²y-[5x²y-﹙2xy-x²
实数x,y满足x²+y²+8x+6y+25=0,求x²+4xy+4y²分之x
已知x²-5xy+6y²=0,那么x+y分之x-y等于多少