(本题满分15分)函数在处取得极小值–2.(I)求的单调区间;(II

(本题满分15分)函数处取得极小值–2.(I)求的单调区间;(II)若对任意的,函数的图像与函数的图像至多有一个交点.求实数的范围.

答案

(Ⅰ)  是单调递增区间,是单调递减区间. (Ⅱ)  


解析:

(I)

由题意得:  解得…………………………………………4 分

∴当;当 

是单调递增区间,是单调递减区间.…………………………………7 分

(II)

由方程组 

至多有一个实根………………………………………………9 分

恒成立……………12 分

,则由此知函数在(0,2)上为减函数,在上为增函数,

所以当时,函数取最小值,即为,于是………………………………15 分

相关题目

在中国的奴隶社会,文字发展的顺序是(     )A、甲骨文
在中国的奴隶社会,文字发展的顺序是(     )A、甲骨文—金文—大篆                    B、金文—大篆—甲骨文 C、甲骨文—大篆—金文 
Our teacher told us to speak English as much as possible.(相近的选项)
Our teacher told us to speak English as much as possible.(相近的选项) A. as much as we could            B. much more  C. as much as I can                D. mu
--- I had thought he would be nervous in this speech competition, but he turned
--- I had thought he would be nervous in this speech competition, but he turned out to be calm. --- He        quite enough preparation for it.        A.should do  B.must do   
.对于烃的命名正确的是( ) A.4﹣甲基﹣4,5﹣二乙基己
.对于烃的命名正确的是( ) A.4﹣甲基﹣4,5﹣二乙基己烷    B.3﹣甲基﹣2,3﹣二乙基己烷 C.4,5﹣二甲基﹣4﹣乙基庚烷    D.3,4﹣二甲基﹣
 As long as you’ve paid in advance, we won’t ______ you ______ delivery.
 As long as you’ve paid in advance, we won’t ______ you ______ delivery.   A. charge; for          B. charge; with        C. pay; for                     D.
对你不应该知道的事情,不要感到好奇。(be curious about) _______
对你不应该知道的事情,不要感到好奇。(be curious about) ___________________________________________________________
关于日本和英国的叙述,正确的是(   ) A.两国均是岛国
关于日本和英国的叙述,正确的是(   ) A.两国均是岛国,工业均为“临海型”布局          B.两国农业均以畜牧业为主 C.两国均为发达的工
301. In the middle of last century planes began to be used to transport both pas
301. In the middle of last century planes began to be used to transport both passengers and goods. The underlined words means ____. A. carry                 B. put up           

最新题目