x^2+y^2=7
x^3+y^3=0
(x+y)*(x^2+y^2-xy)=0
(x+y)*(7-xy)=0,则:
x+y=0或7-xy=0。目标为x+y最大值。
则:xy=7,
x^2+y^2+2xy=7+14=21
(x+y)^2=21
x+y=根号21
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