若2^x=6,4^y=5则2^x-2y求快速!要详细!谢谢!

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 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 若x^2+y^2-6x+4y+13=0 求x+y 因式分解 若 x^2+4x+y^2-6y+13=0 求y^x 若2x-3y=0,求5x+4y/3x-2y 已知y/x=2,则求代数式x+y/4x-5y的值 若x^2+y^2+5/4=2x+y,求x^Y+y^x的值? 若(x-y)乘(x+y)=5,(x+y)^2=4,试求x-y的值 若5x+3y=3x+4y=x+2y+6,则x+y=___ 已知x/3=y/4=z/6 ,求代数式2x-y+5z/x+3y-z的值已知x+y/x-y等于3,求x+y/x-y-3（x-y）/5（x+y）的值若b/a=3,则代数式3a-b/a的值为 x*x+y*y-2x+4y+5=0求x, 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 如果|X|=4 |Y|=2 且|X+Y|=X+Y 求X+Y 求(X+Y)(X-Y)(X²+Y²),X=5 Y=2, 若x*x+y*y=x+y-1/2,求x,y的值如题 x,y 满足x(x-2)-y(y-6)=-10,求x,y的值 (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值