求y=(5x-1)/(4x+2) (x

求y=(5x-1)/(4x+2) (x (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) 4x-3y=5 x^2+y^2=1 求x,y 3x+4y-5=0 x^2+y^2=1求x.y x^2-x+y^2+2y+5/4=0 求x^-1+y^0 求值域 1,y=(x+2)/(x*x+3x+6) 2,y=3x/(x*x+4) {(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=? x*x+y*y-2x+4y+5=0求x, 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x^5+x^4y+x^4+x+y+1=0,且3x+2y=1,求x,y的值 求y=(x^2-4x+13)/(x-1) x属于[2,5]的值域 求函数y=x方+4x+5/x+2(x≥-1)的最小值 y=x^5+√x+1/x^3 ,求导数结果是y’=2x-5/2x^-7/2-3x^-4,对y求导数 已知x²+y²+5=2x+4y,求代数式（2x²-（x+y)(x-y))x((x+y-1)(x-y+1)+(1-2y)) 已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(x+2009y)的值. 已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(x+2009y)的值. 求值域,Y=5x-1/4x+2 y=5x-1／4x+2,求值域