求y=(1-x^2)/x x∈(0,1/4]的值域

已知x^2+y^2-8x+12y+52=0 ,求1/2x-1/x-y(x-y/2x-x^2+y^2) 已知x^2+y^2-8x+12y+52=0 ,求1/2x-1/x-y(x-y/2x-x^2+y^2) 若(x+y)(x+y-1)-2=0,求x+y的值求 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 求导数y=3x-x^2 求y',y'/ x=1 y'/x=0 x²-4x-1=0,求(2x-3)²-(x+y)(x-y)-y² 若|x+y-1|+（x-y-2)²=0,求代数式（x+2y)(x-2y）-（2x-y)(-y-2x)的值. x+2y=2x+y+1=7x-y 求：2x-y? (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 y=(2x*x-2x+3)/(x*x-x+1),求值域? 求值域1.y=x-2x+3 x∈［0,3］ 2.y=3x+6x+5 x∈（-1求值域1.y=x-2x+3 x∈［0,3］ 2.y=3x+6x+5 x∈（-1,2］ 3.y=√（x+2x+3）+2 x²+2x+y-1=0 求x+y的最大值x²+2x+y-1=0 求x+y的最大值 已知x+2y=1,x,y∈R,求x^2y的最大值 x>0 y>0已知x+2y=1求 1/x+y/1最小值 x>0y>0且1/x+9/y=1求2x+y最小值