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《高考数学第一轮复习4_函数的值域与最值(二)》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、4.函数的值域与最值(二)班级姓名一、选择题1.定义域为的函数的值域为则函数的值域为()(A)(B)(C)(D)2.函数f(x)=x2+mx+n,在区间[1,2]上,当x=1时有最大值1,则m2-4n的最小值为() (A)-8(B)-4 (C)-3 (D)-23.若函数的定义域为,则实数的取值范围是()(A)(B)(C)(D)4.函数的定义域为,值域为,则实数()(A)(B)(C)(D)5.已知则函数的最小值是()(A)1(B)-1(C)(D)二、填空题6.(1)函数的值域为.(2)设函数,则的最小值为___
2、____________.7.函数的最大值为a2,则实数a的取值范围为___________.8.设,则的最大值为.9.已知实数满足且,则的取值范围是.三、解答题10.求函数的最小值.311.已知函数,若在上有意义,求实数的取值范围.12.已知二次函数是常数,且满足条件:且方程有等根.(1)求的解析式;(2)问是否存在实数使的定义域和值域分别为和如果存在,求出的值;如不存在,说明理由.内部资料3仅供参考9JWKffwvG#tYM*Jg&6a*CZ7H$dq8KqqfHVZFedswSyXTy#&QA9wkxFyeQ^!djs#XuyUP2kNXpRWXmA&UE9aQ@Gn8xp$R#&
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