中学生网络课堂本课配套习题挑战模式1/3
单选题
难度系数：
1.
函数ƒ (x)=−x2+4x−3 在区间
上的最大值和最小值分别是（ ）
| A: 1，0 |
| B: 3，—6 |
| C: 1，—8 |
| D: 1，—24 |
一次做对，真牛！
+5奖励规则>
- 提示1：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
- 提示2：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
- 提示3：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
- 答案：Qw==
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
本课配套习题挑战模式2/3
单选题
难度系数：
2.函数
在区间
上的最大值、最小值分别是（ ）
在区间上的最大值、最小值分别是（ ） A:  ，0 |
B:  ，0 |
| C: ， |
| D: 最大值是，无最小值 |
一次做对，真牛！
+5奖励规则>
- 提示1：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
- 提示2：IDxpbWcgd2lkdGg9MjU2IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzJFL0IxL3JCQUNKMVNnOFFyRDZ5Z1RBQUFFMFl4d212QTE2NC5wbmciPg==
- 提示3：IDxpbWcgd2lkdGg9MjggaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvNjIvNzEvckJBQ0UxU2c4UXFpRTU0S0FBQUJqQzgzUFV3OTg0LnBuZyI+5Zyo5Yy66Ze0PGltZyB3aWR0aD0zOSBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8yRS83Mi9yQkFDSmxTZzhRcmpOVGQzQUFBQmJzTzZKYWcwNDMucG5nIj7kuIrljZXosIPpgJLlh48=
- 答案：Qw==
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
本课配套习题挑战模式3/3
单选题
难度系数：
3.函数
，
，则
的最小值是（ ）
，，则的最小值是（ ） A:  |
| B: 没有最小值 |
| C: 2 |
| D: 1 |
一次做对，真牛！
+5奖励规则>
- 提示1：IDxpbWcgd2lkdGg9MTgwIGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzYyLzcxL3JCQUNFMVNnOFE2Qno3dFlBQUFESExlMkFaUTM2NC5wbmciPu+8jDxpbWcgd2lkdGg9NzkgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvOEYvMDcvckJBQ0ZGU2c4UTJCMU9feUFBQUNCV3Fjd1JRODIyLnBuZyI+
- 提示2：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
- 提示3：IDxpbWcgd2lkdGg9MjQxIGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzJFL0IxL3JCQUNKMVNnOFE2amdJZFZBQUFENmw3b2h2MDU5Mi5wbmciPu+8jOmCo+S5iDxpbWcgd2lkdGg9MjggaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMkUvQjEvckJBQ0oxU2c4UVhSd2RSREFBQUJpXzhFd0RjMTUxLnBuZyI+5ZyoPGltZyB3aWR0aD01NSBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC84Ri8wNy9yQkFDRkZTZzhRNndybjBoQUFBQnIyaTZyYTA5NDAucG5nIj7kuIrljZXosIPpgJLlop4=
- 答案：RA==
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
