题目

(满分14分)已知函数在时取得极值.    (I)试用含的代数式表示;   (Ⅱ)若,求的单调区间. 答案:解:( I )依题意,得      由于为函数的一个极值点,则,得 (Ⅱ)由(I)得,       故       令,则或,由于   当时,,当变化时,与的变化情况如下表:由上表可得,函数的单调增区间为和,单调减区间为;句型转换。(8分)1. He needs some bananas.(就划线部分提问)__________ __________ he need?2. My mother doesn’t buy anything in the shop.(改为同义句)My mother __________ __________ in the shop.3. Will there be a new store in the neighborhood? (作否定回答)No, ___________ __________.4. 你每天喝多少水?(完成句子)__________ __________ water do you drink every day?
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