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【简答题】
已知函数f(x)=e x -ax，其中a＞0. （1）若对一切x∈R，f(x) 1恒成立，求a的取值集合； （2)在函数f(x)的图像上去定点A（x 1 , f(x 1 )）,B(x 2 , f(x 2 ))(x 1 2)，记直线AB的斜率为k，证明：存在x 0 ∈（x 1 ,x 2 ）,使 恒成立.
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反馈参考答案：
举一反三
【单选题】下列太平天国的诸活动中,能与当时世界历史潮流同步的是
A.
颁布《天朝田亩制度》
B.
洪仁玕《资政新篇》提出的主张
C.
建立农民政权
D.
规定农、副业产品的生产与分配由农村政权的基层组织实行管理
【单选题】David has decided ___________football at the end of this season.
A.
give up
B.
giving up
C.
to give up
D.
having given up
【简答题】One evening, Mrs. White said to her husband in surprise, “You look like the football player in the on TV!” Mr. White watched that man carefully and then said, “Yeah. He is really like me.” A week...
【单选题】What does the word 'it' in Line of Paragraph 3 refer to?
A.
A sense of humor.
B.
The football game.
C.
His goal in the game.
D.
The score of the game.
【单选题】Daniel is a very _____ football player and he plays football very _____. [ ]
A.
good, good
B.
well, good
C.
good, well
D.
well, well
【简答题】They are living ______happy life now.
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