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一、不含参数的一元不等式f(x)>01.统一的函数背景。不等式f(x)>0的解集与函数y=f(x)的相应的符号域等价,既可以通过对f(x)>0的解集的寻
First, the unary inequality f(x)>01. Consistent function background without parameters. The solution set of the inequality f(x)>0 is equivalent to the corresponding sign domain of the function y=f(x), and can be obtained by finding the solution set for f(x)>0.