实数x,y满足方程x^2/25+y^2/16=1(x≥0,y≥0),求4x+5根号下3y的最大值

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实数x,y满足方程x^2/25+y^2/16=1(x≥0,y≥0),求4x+5根号下3y的最大值
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实数x,y满足方程x^2/25+y^2/16=1(x≥0,y≥0),求4x+5根号下3y的最大值
实数x,y满足方程x^2/25+y^2/16=1(x≥0,y≥0),求4x+5根号下3y的最大值

实数x,y满足方程x^2/25+y^2/16=1(x≥0,y≥0),求4x+5根号下3y的最大值
令x^2/25=(sinb)^2,y^2/16=(cosb)^2
得x=5sinb,y=4cosb,(0