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记方程ax+b=0,cx+d=0的两根分别为t_1、t_2,在t_1=t_2的情况下,f(x)的值域易求,以下假设t_1t_2时,由于f(x)与f(-x)值域相同,可类似讨论f(-x)的值域).
The two equations ax+b=0 and cx+d=0 are respectively t_1 and t_2. In the case of t_1=t_2, the value range of f(x) is easy to find. The following hypothesis t_1t_2 When f(x) and f(-x) are in the same domain, we can similarly discuss the value range of f(-x).