设2000X^3=2001Y^3=2002Z^3,XYZ＞0 且2000X^2=2001y^2=2002z^2=2000的立方 +2001的立方 +2002的立方,求x分之一+y分之一+z分之一的值.（提示：可设2000x^3=2001y^3=2002z^3=a,则2000x^2=x分之a,则2001y^2=y分之a,2002z^2=z分之a

设x.y满足条件y>=0.X-Y+1>=0.x+y-3 设x,y满足约束条件{x>=0,y>=x,4x+3y 设x,y满足约束条件x>=0 y>=x 4x+3y 设函数y=(1+x^3)^(cosx),求y' 设变量X,Y满足约束条件{X-Y+3>=0,X+Y>=0,-2 设变量x,y满足约束条件:x-y+3>=0 x+y>=0 -2 设不等式组x+y-2>=0,x-3y+6>=0,x-y 设X+Y=K,且X,Y满足不等式组 X-3Y 设y=3^x+core^x,求dy 设x,y,z为整数且满足|x-y|^2001+|z-x|^2002=1,求|x-y|^3+|y-z|^3+|z-x|^3的值? 设正实数x,y满足x^3+y^3=x-y,求证：x^2+4y^2 设实数X,Y满足2X+Y-2>=0,X-2Y+4>=0,3X-Y 设变量x,y满足约束条件x-y>=-1,x+y>=1,3x-y 设实数x,y满足方程组①x-y-2=0 ③2y-3 设A={(x,y)/x+y 设M={(x,y)||x|+|y| 设不等式组{x>=0,x+3y>=4,3x+y 设2x分之3x-5y=4 则y分之x=