中学生网络课堂
高二数学 (人教版)
导数与函数
本课配套习题挑战模式1/3
单选题
难度系数：
1.
函数
的导函数的最大值等于1，则实数
的值为（ ）
| A: 2 |
| B:
|
| C: -1 |
| D: 1 |
1
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5rGC5a+85Ye95pWw77yM5YyW566A6K6h566XPC9wPg==
- 答案：Qg==
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
本课配套习题挑战模式2/3
单选题
难度系数：
2.
下列函数中，在（0，
）上有零点的函数是（ ）
| A:
|
| B:
|
| C:
|
| D:
|
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5YiG5Yir5a+55Zub5Liq6YCJ6aG55Lit55qE5Ye95pWw6L+b6KGM5rGC5a+8PC9wPg==
- 提示2：PHA+5Yip55So5a+85Ye95pWw56Gu5a6a5Zyo5Yy66Ze077yIMO+8jDxpbWcgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8zRi9BQy9yQkFDSmxUTE5heUM3NWstQUFBQmpqaUJXczQyOTQucG5nIiBkYXRhLWNrZS1zYXZlZC1zcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzNGL0FDL3JCQUNKbFRMTmF5Qzc1ay1BQUFCamppQldzNDI5NC5wbmciIGhlaWdodD0iNDIiIHdpZHRoPSIxNyI+77yJ5LiK55qE5Y2V6LCD5oCnPC9wPg==
- 答案：RA==
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
本课配套习题挑战模式3/3
单选题
难度系数：
3.
设定义在R上的函数ƒ (x) 是最小正周期为2π的偶函数，ƒ ′(x) 是ƒ (x) 的导函数．当x∈[0，π]时，0<ƒ (x)<1 ,当x∈(0,π) 且x≠π2 时，（x−π2 ）ƒ ′(x)>0 ,则函数y=ƒ (x)−sinx 在【−2π，2π】 上的零点个数为（ ）
| A: 2 |
| B: 4 |
| C: 5 |
| D: 8 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+57uT5ZCI5Ye95pWw55qE5ZGo5pyf5oCn5LiU5Li65YG25Ye95pWw55S75Ye65Ye95pWw55qE5Zu+6LGhPC9wPg==
- 提示2：PHA+57uT5ZCI5Ye95pWw5Zu+6LGh5rGC6KejPC9wPg==
- 提示3：PHA+5rOo5oSP5Yy66Ze055qE5YiG5q61PC9wPg==
- 答案：Qg==
PHA+PGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzQ4LzMxL3JCQUNKMVRhekdYQlpDX3NBQUNQZzl6ZGVmTTAxNy5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvNDgvMzEvckJBQ0oxVGF6R1hCWkNfc0FBQ1BnOXpkZWZNMDE3LnBuZyIgYWx0PSIiIHN0eWxlPSJ3aWR0aDogNDU3cHg7IGhlaWdodDogNDY3cHg7Ij48L3A+
