若x<3，求y=2x+1+1/x-3最大值

y=(x-x^3)/(1+2x^2+x^4)的最大最小值怎么求?y=(x-x^3)/(1+2x^2+x^4)的最大最小值怎么求?y=(x-x^3)/(1+2x^2+x^4)的最大最小值怎么求?分母最小

y=x^2+5/x-2(x>2),y的最小值已知x大于0小于三分之一求函数y=x(1-3x)的最大值?y=x^2+5/x-2(x>2),y的最小值已知x大于0小于三分之一求函数y=x(1-3x)的最大

若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值若2/x-1/y=3,求[y

求函数y=x^5-5x^4+5x^3+1,x属于[-1,2]的最大、最小值求函数y=x^5-5x^4+5x^3+1,x属于[-1,2]的最大、最小值求函数y=x^5-5x^4+5x^3+1,x属于[-

当x取何值时,求下列函数的最大最小值1.y=x+(2/x)2.y=(3x^2)+(1/(3x^2))其实括弧儿是我自己加的,我稍微看一下就能想起来呃~当x取何值时,求下列函数的最大最小值1.y=x+(

若x=1,y=2,求1/(x+y)+1/(x-y)+2x/(x^2+y^2)+4x^3/(x^4+y^4)的值!把数往里带我也会啊，可是老师说要化简的…我凌乱了…各位帮帮忙若x=1,y=2,求1/(x

(x-y)/(x+y)=3求(3x-2y-1)/(x+y-5)(x-y)/(x+y)=3求(3x-2y-1)/(x+y-5)(x-y)/(x+y)=3求(3x-2y-1)/(x+y-5)(x-y)/(

求f(x,y,z)=2x+y+3z在椭圆x^2+y^2=2,x+z=1的最大最小值求f(x,y,z)=2x+y+3z在椭圆x^2+y^2=2,x+z=1的最大最小值求f(x,y,z)=2x+y+3z在

y=(2x*x-2x+3)/(x*x-x+1),求值域?y=(2x*x-2x+3)/(x*x-x+1),求值域?y=(2x*x-2x+3)/(x*x-x+1),求值域?y=2x2;-4x+2-3=2(

X^2+Y^2≦1,求3XY-2(X+Y)的最大最小值X^2+Y^2≦1,求3XY-2(X+Y)的最大最小值X^2+Y^2≦1,求3XY-2(X+Y)的最大最小值设x=rcosθ,y=rsinθ,则0

若(2x-y-1)2+|x-2y-3|=0,求代数式(2x+y)(2x-y)-(x+2y)(x-2y-1)的值若(2x-y-1)²+|x-2y-3|=0,求代数式(2x+y)(2x-y)-(

已知实数X,Y满足X+Y-3≥0X-Y+1≥0X≤11.若Z=2X+Y求Z的最大和最小值2.若Z=X的2次方+Y的2次方求Z的最大和最小值3.若Z=X分之Y求Z的最大和最小值已知实数X,Y满足X+Y-

求值域1,y=(x+2)/(x*x+3x+6)2,y=3x/(x*x+4)求值域1,y=(x+2)/(x*x+3x+6)2,y=3x/(x*x+4)求值域1,y=(x+2)/(x*x+3x+6)2,y

{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?{(x+y)/2+(x-y)/3

y=(X+1)(X+2)(X+3)求导数y=(X+1)(X+2)(X+3)求导数y=(X+1)(X+2)(X+3)求导数dy／dx=(x+1)''(x+2)(x+3)+(x+1)[(x+2)(x+3)]

若x-y=3,x^2-y^2=1,求x+y的值若x-y=3,x^2-y^2=1,求x+y的值若x-y=3,x^2-y^2=1,求x+y的值x-y=3x^2-y^2=1x+y=（x^2-y^2)/(x-

若函数y=cos^2x-sin^2x-√3sin2x+1求最大最小值.和最小周期若函数y=cos^2x-sin^2x-√3sin2x+1求最大最小值.和最小周期若函数y=cos^2x-sin^2x-√

若(-x+6):(x-y):(4x+y)=3:14:1,求x+y若(-x+6):(x-y):(4x+y)=3:14:1,求x+y若(-x+6):(x-y):(4x+y)=3:14:1,求x+y(-x+

若(-x+6):(x-y):(4x+y)=3:14:1,求x+y若(-x+6):(x-y):(4x+y)=3:14:1,求x+y若(-x+6):(x-y):(4x+y)=3:14:1,求x+y(-x+

已知XY满足(X-1)^2+(Y+2)^2=4求S=3X-Y的最大最小值已知XY满足(X-1)^2+(Y+2)^2=4求S=3X-Y的最大最小值已知XY满足(X-1)^2+(Y+2)^2=4求S=3X