先化简,再求值:,其中。

先化简,再求值:,其中

答案

解:

时,

相关题目

下列叙述中哪项不属于线粒体、叶绿体和核糖体共有的特征(
下列叙述中哪项不属于线粒体、叶绿体和核糖体共有的特征( ) A.都存在于高等植物细胞中        B.都有能量转换 C.都含有核酸           
There are many differences between the two popular programs —— Happy Camp
There are many differences between the two popular programs —— Happy Camp & Where Are We Going?Dad!The former is filled with happiness,while the _______ is full of love. A.official
对于建设中国特色社会主义的理解错误的是(    ) A.必须
对于建设中国特色社会主义的理解错误的是(    ) A.必须坚持以马克思主义、毛泽东思想、邓小平理论和“三个代表”重要思想为指导 B.必须
Li Daiyu and her cousin were on a trip 41   Canada. They decided to take the
Li Daiyu and her cousin were on a trip 41   Canada. They decided to take the cross-Canada train  42   than go directly to Montreal by air. After arriving in Canada’s most beautiful city 43 
以下对绿色植物各种生理活动的叙述欠科学的是 A.在光照下
以下对绿色植物各种生理活动的叙述欠科学的是 A.在光照下只进行光合作用B.蒸腾作用产生的蒸腾拉力,促进植物吸收水分 C.呼吸作用在黑暗中也能
读塔里木盆地示意图。在盆地的四周是由冰雪融水补给的河
读塔里木盆地示意图。在盆地的四周是由冰雪融水补给的河流冲积而成的冲积扇,绿洲就在冲积扇的中下部。这些地区人口集中,农牧业较为发达,交
 —Who should be responsible for the accident?    —The boss, not the worke
 —Who should be responsible for the accident?    —The boss, not the workers. They just carry the orders _______. A. as told         B. as are told          C. as telling   
                                   Martin Fre
                                   Martin Freeman and his new movie About the movie It is the __61__(finally)part of the Hobbit movie trilogy, and it came out in t

最新题目