5x^2+6xy+5y^2-30x-8=0是哪种圆锥曲线方程式?
x*-2xy+3y*=9 4x*-5xy+6y*=30
已知x>0,y>0,且x+6y=5根号xy,求(2x+根号xy-y)分之(x+根号xy+2y)的值
x+y=8,xy=-2,求(5xy+4x+7y)+(6x-3xy)-(4xy-3y)的值
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
已知x>0,y>0,x+根号xy-6y=0,求4x+5根号xy-6y分之x+2根号xy
若x-y=5,xy=6,求x^2-xy^2和x^2y+xy^2
已知关于XY的方程式,X+2Y=6,2X+Y=3K,且X+Y
若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*
已知x^2+y^2-4x+6y+13=0求(xy+y^2/5x^2-5xy+xy+y^2)·(5/x+y)-(y/x-y
已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值
已知X+Y=6,XY=-4,求(5X-4Y-3XY)-(8X-Y+2XY)的值
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8