若实数x,y满足x/(3^3+4^3)+y/(3^3+6^3)=1,x/(5^3+4^3)+y/(5^3+6^3)=1,则x+y=______

如果实数x,y满足x-4y+3 已知实数x,y满足约束条件x+y>3,y 设实数x,y满足3 设实数x,y满足3 不等式：设实数x,y满足3 .如果实数x,y满足 x-4y+3最小值3，那么实数k=? 已知实数xy满足|x|/4+|y|/3 若实数x,y满足不等式组｛x+y≥2 ｛2x-y≤4 ｛x-y≥0 ,则2x+3y的最小值是? 设正实数x,y满足x^3+y^3=x-y,求证：x^2+4y^2 若实数x,y满足不等式x-y>=-1,x+y>=1,3x-y 若实数x,y满足不等式x-y>=-1,x+y>=1,3x-y 设实数X,Y满足2X+Y-2>=0,X-2Y+4>=0,3X-Y 已知实数x,y满足（x+y)(x+y+3)-4=0则x+y的值是 若实数x,y满足约束条件x-y-2=0,2y-3 若实数x,y满足x-4y+3≤0,3x+5y-25≤0,x≥1,则2x-y的最大值是多少 若实数x,y满足x的平方+y的平方-4x-2y+5=0,则（x+y）/2x-3= 已知实数x、y满足x²-3x+4y=7,3x+4y的最大值为 已知实数x、y满足x²-3x+4y=7,3x+4y的最大值为