题目

函数 (1)若函数的值域是,求的值; (2)若对于任意恒成立,求的取值范围. 答案:解:(1),又, 的值域为,根据条件的值域为, (2),整理得, 令当时,, 那么对于任意恒成立对于任意恒成立,根据实根分布 的二实根,一根小于等于1,一根大于等于2 The fact that so many people still smoke in public places ________ that we may need a nationwide campaign to raise awareness of the risks of smoking.(2011·江苏)A.suggestB.suggestsC.suggestedD.suggesting
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