在数学竞赛解题中,对比较复杂或是难以找到解题思路的问题,有时可以从简单情形或是特殊情形入手,先看在这些情形下,问题是怎样解决的,往往能从中发现问题在一般情形的一些端倪。对于高考中的一些较难问题,往往也可以借鉴这一办法,来寻找解题思路。2011年四川理科高考的最后一题如下:已知f(x)=23x+12,h(x)=姨x.(1)设函数F(x)=f(x)-h(x),求F(x)的单调区间与极值; In the mathematical contest problem solving, the more complex or difficult to find solutions to the problem of thinking, and sometimes can be simple or special circumstances to start with the first look at these situations, the problem is how to solve the problem can often be found in the Some clues to the general situation. For the college entrance examination in some of the more difficult issues, often can learn from this approach to find solutions to problems. The last question of Sichuan Science Entrance Examination in 2011 is as follows: It is known that f (x) = 23x + 12 and h (x) = aunt x. (1) Let F Find the monotonous interval and extreme value of F (x);