题目

When a consumer finds that something he or she bought is faulty（假冒的） or in some other way does not live up to what the producer says for it, the first step is to present the warranty（保单），or any other records that might help, at the store of buying．In most cases, this action produces results．However, if it does not, there are various means the consumer may use to gain satisfaction． A simple and common method used by many consumers is to complain directly to the store manager．In general, the “higher up” the consumer takes him or her complaint, the faster he or she已知函数.（1）求函数的单调区间和极值；（2）证明：当时，函数没有零点（提示：）．