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【單選題】

設(shè)函數(shù) f ( x ) = 2 ( 1 ) x 2 - 9ln x 在區(qū)間 [ a - 1 , a + 1] 上單調(diào)遞減,則實(shí)數(shù) a 的取值范圍是 ( )

參考答案：

舉一反三

【單選題】What do the posters say？

A.

They can teach people to speak English better.

B.

They can teach people to speak a foreign language within a short time.

C.

They can teach people to speak a foreign language about everything.

相關(guān)題目：

【單選題】What do the posters say？

A.

They can teach people to speak English better.

B.

They can teach people to speak a foreign language within a short time.

C.

They can teach people to speak a foreign language about everything.

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