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数轴标根法主要用于解决不等式问题,而函数单调性问题,需要根据f(′x)的正负,判断(fx)的单调性,故可用数轴标根法给予解决.一、f(′x)为一元二次多项式此类情况也常用一元二次不等式的解法解决.
Axis-root method is mainly used to solve the problem of inequality, but the function monotonicity needs to judge the monotonicity of (fx) according to the positive and negative of f (’x) x) is a unitary quadratic polynomial This type of solution is also commonly used quadratic inequality solution.