题目

函数的极大值是______. 答案：【答案】-1【解析】确定函数的定义域，求出，进而得出单调区间，即可得到极大值.的定义域为，∵，∴，令，解得，当时，；当时，，递增区间是，递减区间是，故在处取得极大值，极大值为.故答案为：.A balloon? Yes, please. Here ___ ___.A. are you B. you are C. it is