设实数x、y满足x^2+4y^2=4x,则x+y的范围是?步骤怎么样的呀?
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设实数x、y满足x^2+4y^2=4x,则x+y的范围是?步骤怎么样的呀?设实数x、y满足x^2+4y^2=4x,则x+y的范围是?步骤怎么样的呀?设实数x、y满足x^2+4y^2=4x,则x+y的范
设实数x、y满足x^2+4y^2=4x,则x+y的范围是?步骤怎么样的呀?
设实数x、y满足x^2+4y^2=4x,则x+y的范围是?
步骤怎么样的呀?
设实数x、y满足x^2+4y^2=4x,则x+y的范围是?步骤怎么样的呀?
x^2+4y^2=4x
(x-2)^2/4+y^2=1
参数方程:x=2cost+2,y=sint
假设tant=1/2
x+y,
=2cost+sint+2
=√5sin(t+p)+2
2-√5
[2-√5,2+√5]
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