已知实数x,y满足方程x的平方+y的平方-4x-1=0
(1)求y-x的最大值和最小值
(2)求的x的平方+y的平方的最大值和最小值
人气:306 ℃ 时间:2020-01-29 21:31:33
解答
方程化为(x-2)²+y²=5.令x=2+√5cosθ,y=√5sinθ,y-x=√5sinθ-(2+√5cosθ)=√10sin(θ-π/4)-2,最大√10-2,最小-√10-2.x²+y²=(2+√5cosθ)²+(√5sinθ)²=9+4√5cosθ,最大9+4√5,...
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