设点P坐标(2cosa,√3sina)
x+2y=4cosa+2√3sina
=2√7cos(a-b),其中tanb=√3/2
cos(a-b)=1时,x+2y有最大值2√7.
点P在椭圆x2/4+y2/3=1上,则x+2y的最大值
点P在椭圆x2/4+y2/3=1上,则x+2y的最大值
数学人气:981 ℃时间:2020-02-02 07:33:10
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