考情分析
必备知识
3.函数不等式的类型与解法 (1)任意x∈D,f(x)≤k⇔f(x)max≤k; (2)存在x∈D,f(x)≤k⇔f(x)min≤k; (3)任意x∈D,f(x)≤g(x)⇔f(x)max≤g(x)min; (4)存在x∈D,f(x)≤g(x)⇔f(x)min≤g(x)max.