求y=(5x-1)/(4x+2) (x

求y=(5x-1)/(4x+2) (x 已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-( 已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y 已知x²+y²+5=2x+4y,求代数式（2x²-（x+y)(x-y))x((x+y-1) 求函数y=\x-1\+\x-2\+\x-3\+\x-4\+\x-5\+\x-6\+.+\x-10\的最小值 已知4x=9y求(1)x+y/y (2)y-x/2x 若x^5+x^4y+x^4+x+y+1=0,且3x+2y=1,求x,y的值 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* 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 求值域Y=5x-1/4x+2! 求值域,Y=5x-1/4x+2 y=4x^2-5x+7/x-2(x>2),求y最值