用转化思维突破“集合与简易逻辑”综合问题

• 作 者: 运熙伦
• 机 构: 甘肃省张掖市张掖中学,
• 出 处: 数理化学习(高三版)
• 发表日期: 2015年08期

一、理解集合意义,将问题转化为曲线之间的位置关系或函数最值解决例1函数定义在R上,对任意实数m,n,恒有f(m+n)=f(m)f(n),且当x>0时,0f(1)|},B={(x,y)|f(ax-y+2)=1,a∈R},若A∩B=φ,求实数a的取值范围. First, to understand the significance of the collection, the problem is transformed into the relationship between the curves or the function of the value of the most solution Example 1 R defined on any real m, n, constant f (m + n) = f (m) f (n) and 0 0. If the set A = {(x, y) | f (x2) f (y2)> f (x, y) | f (ax-y + 2) = 1, a∈R}. If A∩B = φ, find the real range of a.