题目内容

(本题满分15分)

已知函数,过点P(1,0)作曲线的两条切线PMPN,切点分别为M,N

   (1)当时,求函数的单调递增区间;

   (2)设|MN|=,试求函数的表达式;

                                                                                                   

(本题满分15分)

解:(1)当  --------2分

 . --------4分

则函数有单调递增区间为        --------5分

   (2)设MN两点的横坐标分别为

      

                     …………8分

同理,由切线PN也过点(1,0),得 (2)---------------9分

       由(1)、(2),可得的两根,

        ------------------------------------------------------11分

      

       把(*)式代入,得

       因此,函数 ----------------15分

                                                                                                   

练习册系列答案
相关题目

((本题满分15分)
某有奖销售将商品的售价提高120元后允许顾客有3次抽奖的机会,每次抽奖的方法是在已经设置并打开了程序的电脑上按“Enter”键,电脑将随机产生一个                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        1~6的整数数作为号码,若该号码是3的倍数则顾客获奖,每次中奖的奖金为100元,运用所学的知识说明这样的活动对商家是否有利。

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网