已知x等于2+√3,y=√3 -2,求（x⁴-y⁴)÷x+y分之x²+y²的

已知x+y分之x-y=2,求2x+2y分之x-y-3x-3y分之2x+2y的值 已知x+y分之x-y=2 求x+y分之3x-3y 减x-y分之2(x+y)的值 已知x-y除以x+y=3,求代数式x+y分之2（x-y)-3(x-y)分之x+y的值. 已知x-3y=0,y≠0,求x²-2xy+y²分之2x+y×（x-y）的值 当x＋y分之x-y等于2时,求x-y分之2{x＋y}-3{x＋y}分之x-y的值? 已知x,y的值满足方程组x+2y=3,x-y=-2,求x/(x-y)²+x²-y²/(x+ 已知实数x,y满足x²+y²+2x+2√3y=0.求x²+y²的最大值.②求x+ 已知|x-y-根号3|+(x-2y²)=0,求2分之x+y²的值? 已知y-2x=0,求3x²-2y²/(x+y)(x-y)的值 已知x+3y=2,求代数式(x²-y²/x+y)-【2(x+y)】的值 已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)