来自顾学真的问题
已知x,y∈R,且满足2x2+y2=6x,那么x2+y2+2x的最大值为______.
已知x,y∈R,且满足2x2+y2=6x,那么x2+y2+2x的最大值为______.
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2020-05-0419:53
已知x,y∈R,且满足2x2+y2=6x,那么x2+y2+2x的最大值为______.
已知x,y∈R,且满足2x2+y2=6x,那么x2+y2+2x的最大值为______.
2x2+y2=6x化为y2=6x-2x2,y∈[0,92