已知:x=5-2√6,y=5+2√6,求5x^2-12xy+5y^2
√x(√x+2√y)=√y(6√x+5√y,求x-3√xy+2y/x+√xy-6y
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
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+x(xy+y)的值
已知xy^2=-6,求-xy(x^3y^7-3x^2y^5-y)的值
已知xy²=-6,求xy(x^3y^7-3x^2y^5-11.5y)的值
已知xy=2(x+y),求(5x-xy+5y)/(3xy-x-y)的值
已知xy/x+y=3,求代数式2x-5xy+2y/x-3xy+y
已知xy/x+y=2,求代数式3x-5xy+3y/-x+2xy-y的值
已知x-y=2xy,求代数式3x-5xy-3y/x+xy-y的值
已知X+Y=2XY,求4X-5XY+4Y 除以X+XY+Y 的值
已知X+Y分之XY=2,求-X+3XY-Y分之3X+5XY+3Y
已知x-y=6,xy=-2,求3(xy+x-2y)-5(y-2x)+2(xy-x)的值.