若5x-7xy-6y^2=0,求3x\y的值（要过程）

若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值 若(3xy+2)^2+|7-x-y|=0,求代数式(5xy+10y)-[-5x-(4xy-2y+3x)]的值 若(3xy+2)+|7-x-y|=0,求代数式（5xy+10y）-[-5x-（4xy-2y+3x）]的值. 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*y)的值 若xy=2（x+y),求 （3x-5xy+3y)÷(-x+3xy-y) 的值 已知X-XY-2Y=0求2X+3XY-Y/X-2XY+5Y 诺x+y=6,xy=4 求(5x-4y-3xy)-(8x-y+2xy) 求（3x^+y^-5xy）-【2x^-（-4xy-y^+7x^）】=? 求（3x^+y^-5xy）-【2x^-（-4xy-y^+7x^）】=? x+y=8,xy=-2,求(5xy+4x+7y)+(6x-3xy)-(4xy-3y)的值 化简求值,若X方-2XY+Y方+1XY-11=0,求X方+6XY+9Y方分之X方-25Y方*5X-25Y分之X+3Y的值 已知xy^2=-6,求-xy(x^3y^7-3x^2y^5-y）的值 若（x+1)^2+|y-2|=0,求3x^2-[5xy-(x^2y-3xy)+4x^2y-8xy]的值 已知x+y=2xy,且xy不等于0,则求-2x+6xy-2y/(7x+5y)-9xy-(3x+y)=___ 已知x,y>0 2x+y+3=xy 求5x+4y最小值 已知x^2+9y^2-2x-6y+2=0,求{-（xy/（x-y）^2}^4*(y^2-xy/x)^3*x^4/y^10/(x/xy-y^2)^5的值 若2x²+xy+3y²=-5,求(9x²+2xy+6)-(xy+7x²-3y²-5)的值 已知x^3+xy^2+x+x^2y+y^3+y=0,求5x-6y/3x+4y的值.