求y=((2x+1)∧2(x+2))/((3-x)(3x-5)）的导数

x+2y=2x+y+1=7x-y 求：2x-y? 已知x+y=a,2x-y=-2a,求[（x/y-y/x)/(x+y)-x(1/x-1/y)]/[(x+1)/y]的值 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) 若x*x+y*y=x+y-1/2,求x,y的值如题 x+y=1,xy=-1/2,求x(x+y)(x-y)-x(x+y)2 {(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=? 求反函数y=x^2-2x,x>1 求y =2^x -1/x+1在x y=(2x*x-2x+3)/(x*x-x+1),求值域? 求y=(5x-1)/(4x+2) (x y=x*x-2x+1求导数 y=(X+1)(X+2)(X+3)求导数 y=x+1/x(x>2)值域怎么求 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 求值域 1,y=(x+2)/(x*x+3x+6) 2,y=3x/(x*x+4) 已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙 已知：2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x)