MT【342】條件為非負實數

已知$x,y,z$為非負實數,滿足$(x+\dfrac{1}{2})^2+(y+1)^2+(z+\dfrac{3}{2})^2=\dfrac{27}{4}$,則$x+y+z$的最小值為______ ...

MT【349】同時取到

已知$\theta \in[0,2\pi]$求$2\cos\theta-\sin\theta-\dfrac{\sin\theta+\sqrt{5}}{\cos\theta+\sqrt{5}}$的最小值 ...