若實數x，y滿足且的最小值為-4，則 k的值為________________。

問題詳情

4.若實數x，y滿足

且

的最小值為-4，則 k的值為________________。

參考答案

答案：C
難度：簡單0.851464
統計：A(14),B(4),C(407),D(11),E(0)

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