中学生网络课堂本课配套习题挑战模式1/5
单选题
难度系数：
1.已知正数
满足
，则
的最小值是（ ）
满足，则的最小值是（ ） | A: 18 |
| B: 16 |
| C: 8 |
| D: 10 |
一次做对，真牛！
+5奖励规则>
- 提示1：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
- 提示2：IOWIqeeUqOWfuuacrOS4jeetieW8j+axguacgOWwj+WAvO+8jOazqOaEj+etieWPt+aIkOeri+eahOadoeS7tuOAgg==
- 答案：QQ==
6Kej77yaPGltZyB3aWR0aD0xODIgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvQUQvNEEvckJBQ0UxTS1pV3pqbzU4V0FBQUR0V0NMN0tvNzIyLnBuZyI+PTEwPGltZyB3aWR0aD02NSBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC84QS9EMC9yQkFDRkZNLWlXNmo3aDBpQUFBQ1BrU1BINW84MTIucG5nIj7vvIzlm6DkuLo8aW1nIHdpZHRoPTE5IGhlaWdodD0yMSBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzhBL0QwL3JCQUNGRk0taVdxeEJNbktBQUFCY2kyQUFSczUwOC5wbmciPumDveaYr+ato+aVsO+8jOaJgOS7pTxpbWcgd2lkdGg9NDkgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvOEEvRDAvckJBQ0ZGTS1pVzdRcDJwNEFBQUNHaDVoOVYwNTk2LnBuZyI+6YO95piv5q2j5pWw77yMMTA8aW1nIHdpZHRoPTY5IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwL0FELzRCL3JCQUNFMU0taVc3UlQtRmpBQUFDT0haeGtuUTExNS5wbmciPjEwKzI8aW1nIHdpZHRoPTgzIGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzhBL0QwL3JCQUNGRk0taVc3aURRM3FBQUFDenpwd0VsQTUyMS5wbmciPizlvZPkuJTku4XlvZM8aW1nIHdpZHRoPTgzIGhlaWdodD0yMSBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwL0FELzRCL3JCQUNFMU0taVc3ajNvUlhBQUFCOUZrYnR2STA3NS5wbmciPuaXtuetieWPt+aIkOeri+OAgg==
本课配套习题挑战模式2/5
单选题
难度系数：
2.已知正实数
（ ）
（ ） | A: 6 |
| B: 8 |
| C: 9 |
| D: 16 |
一次做对，真牛！
+5奖励规则>
- 提示1：IDxpbWcgd2lkdGg9MTczIGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwL0FELzRDL3JCQUNFMU0taVpTU1NSYm5BQUFEUVFSQkdEazc2NS5wbmciPj08aW1nIHdpZHRoPTg3IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzhBL0QyL3JCQUNGRk0taVpURGowYzJBQUFDYXpGQmhVUTYzMi5wbmciPizov5nph4w8aW1nIHdpZHRoPTU3IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzhBL0QyL3JCQUNGRk0taVpTUWdKVkZBQUFDWDExX0dqSTkxNi5wbmciPumDveaYr+ato+aVsA==
- 提示2：IDxpbWcgd2lkdGg9NzQgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvOEEvRDIvckJBQ0ZGTS1pWlNqR1YtVUFBQUNSMlhYU3RBMjAyLnBuZyI+MjxpbWcgd2lkdGg9OTQgaGVpZ2h0PTYyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvOEEvRDIvckJBQ0ZGTS1pWlNpQnk1bEFBQURCMDFNYThvNzcwLnBuZyI+LOW9k+S4lOS7heW9kzxpbWcgd2lkdGg9NjQgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvOEEvRDIvckJBQ0ZGTS1pWlN5d3R6SkFBQUJ6RFVxdDBJMTU2LnBuZyI+5pe2562J5Y+35oiQ56uL44CC
- 答案：Qw==
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
本课配套习题挑战模式3/5
单选题
难度系数：
3.若正数
满足
，则
的最小值是（ ）
满足，则的最小值是（ ） | A: 2 |
| B: 3 |
| C: 5 |
| D: 6 |
一次做对，真牛！
+5奖励规则>
- 提示1：5Li65LqG6IO95aSf5bqU55So5pWw5a2X4oCcMeKAne+8jOaIkeS7rOWvueetieW8jzxpbWcgd2lkdGg9ODIgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvOEEvRDQvckJBQ0ZGTS1pY1RqUW56S0FBQUN0MnpOQ2xnMjk4LnBuZyI+5L2c5Y+Y5b2i5aSE55CG44CCPGJyPg0KPGltZyB3aWR0aD0xNTggaGVpZ2h0PTQ0IHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvQUQvNEYvckJBQ0UxTS1pY1RTQzUxUkFBQUVSWEl0ZU9rMDY1LnBuZyI+77yM
- 提示2：IOaJgOS7pTxpbWcgd2lkdGg9NTIgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvOEEvRDQvckJBQ0ZGTS1pY1RUVlhoVUFBQUNWM043eHF3MjIxLnBuZyI+PTxpbWcgd2lkdGg9NjUgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvQUQvNEYvckJBQ0UxTS1pY1RqSldLcEFBQURTMkNNRDhRMTYzLnBuZyI+77yIPGltZyB3aWR0aD00NyBoZWlnaHQ9NDQgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC84QS9ENC9yQkFDRkZNLWljVFFnY3p6QUFBQzNWbVc4Z0UzMjEucG5nIj7vvIzlsZXlvIDlkI7nlKjlnYflgLzlrprnkIbvvIzms6jmhI/nrYnlj7fmiJDnq4vnmoTmnaHku7bjgII=
- 答案：Qw==
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
本课配套习题挑战模式4/5
单选题
难度系数：
4.设
且
，则
的最小值为（ ）
且，则的最小值为（ ） | A: 9 |
B:  |
| C: 7 |
D:  |
一次做对，真牛！
+5奖励规则>
- 提示1：IOS4uuS6huabtOWlveeahOeUqOWIsOaVsOWtl+KAnTHigJ3miJHku6zlhYjlr7k8aW1nIHdpZHRoPTYyIGhlaWdodD0yMiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwL0FELzUwL3JCQUNFMU0taWRhd3RPNnlBQUFDV0RtNUxRSTA5NC5wbmciPuWPmOW9ou+8jOWPmOaIkDxpbWcgd2lkdGg9ODcgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvOEEvRDUvckJBQ0ZGTS1pZGF3c2I0ckFBQUNRd1FZNzl3NDI4LnBuZyI+Lg==
- 提示2：IDxpbWcgd2lkdGg9NDMxIGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwL0FELzUwL3JCQUNFMU0taWRiZ1oyN3hBQUFHMjB5Wll1azU4NS5wbmciPi4=
- 提示3：IOW9k+S4lOS7heW9kzxpbWcgd2lkdGg9MzUgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvOEEvRDUvckJBQ0ZGTS1pZGJRckUyLUFBQUJpbVpqVDRrMjg2LnBuZyI+LDxpbWcgd2lkdGg9MzUgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvOEEvRDUvckJBQ0ZGTS1pZGZBQnJFOUFBQUJqMElNYWswMDEyLnBuZyI+5pe2562J5Y+35oiQ56uL44CC
- 答案：Qg==
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
本课配套习题挑战模式5/5
单选题
难度系数：
5.已知
,
等差中项是
,且
, 
,则
最小值( )
,等差中项是,且, ,则最小值( ) | A: 3 |
| B: 4 |
| C: 5 |
| D: 6 |
一次做对，真牛！
+5奖励规则>
- 提示1：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
- 提示2：IDxpbWcgd2lkdGg9NTMwIGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwL0FELzUxL3JCQUNFMU0taWUyemdQOTJBQUFGd0ZxNGFUODIwMi5wbmciPuW9k+S4lOS7heW9kzxpbWcgd2lkdGg9NjUgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvQUQvNTEvckJBQ0UxTS1pZTJnU2tUOEFBQUJ2Um56d2hRNjkwLnBuZyI+5pe2562J5Y+35oiQ56uL44CC
- 答案：Qw==
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
