1/5单选题
难度：
1.在∆ABC中，已知AB=
,∠C=
,当∠B=( )时，BC的长取得最大值
,∠C=,当∠B=( )时，BC的长取得最大值 | A |  |
| B | |
| C |  |
| D |  |
- 提示1：
- IOWIqeeUqOato+W8puWumueQhg==
正确答案：QQ==
55Sx5q2j5bym5a6a55CG5b6XOkFCL3NpbkM9QkMvc2luQTxicj7iiLRBQi9zaW5DPUwvc2luNTAmb3JkbTs9QkMvc2luQSDliJlCQz0oTC9zaW41MCZvcmRtOynCt3NpbkE8YnI+4oi05b2Tc2luQeacgOWkpz0x5pe277yMQkPlj5blvpfmnIDlpKc9TC9zaW41MCZvcmRtO+KJiDEuM0w8YnI+5q2k5pe24oigQT05MCZvcmRtO+WImeKIoEI9OTAtNTA9NDAmb3JkbTsgPGJyPuKItOKIoEI9OTAmb3JkbTst4oigQz00MMKw5pe2QkPlj5blvpfmnIDlpKflgLw=
2/5单选题
难度：
2.钝角三角形的三边为
,其中最大角不超过
，则
的取值范围是
,其中最大角不超过，则的取值范围是 | A | (1,+ ) |
| B | [ ,3] |
| C | (1,3) |
| D | [,3) |
- 提示1：
- IOWIqeeUqOS9meW8puWumueQhg==
正确答案：RA==
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
3/5单选题
难度：
3.若钝角三角形的内角2B=A+C，且最大边长与最小边长的比值为m,则实数m的取值范围是
| A | ( ) |
| B | (0, ] |
| C | (2,+ ) |
| D | (,2] |
- 提示1：
- IOWIqeeUqOato+W8puWumueQhg==
正确答案：Qw==
4oi16KeSQj08aW1nIHdpZHRoPTI3IGhlaWdodD0yMSBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzY3L0QxL3JCQUNFMU1zQ0k3QjJPVHRBQUFCZmtTVXV0UTE3OC5wbmciPizku6Q8aW1nIHdpZHRoPTEzIGhlaWdodD0yMSBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzQ0LzI4L3JCQUNGRk1zQ0k3eUV0Y0NBQUFCRFZZMmpOSTIwMS5wbmciPj08aW1nIHdpZHRoPTcgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvNjcvRDEvckJBQ0UxTXNDSTZEWVJzY0FBQUJOQ0dhNzlBNDE1LnBuZyI+PTxpbWcgd2lkdGg9MjQgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvNjcvRDEvckJBQ0UxTXNDSTZDYmRDWEFBQUJ3ekNwN3RnMzU3LnBuZyI+PTxpbWcgd2lkdGg9NTAgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvNDQvMjgvckJBQ0ZGTXNDSTZCYkRjNkFBQUNTRjluX2s0ODk3LnBuZyI+PTxpbWcgd2lkdGg9NyBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC82Ny9EMS9yQkFDRTFNc0NJNlJkbkdkQUFBQkpBZG5ZUU02NTcucG5nIj4rPGltZyB3aWR0aD01MiBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC82Ny9EMS9yQkFDRTFNc0NJNml4SVpXQUFBQ1FSRkpXRTAwOTgucG5nIj4sPGJyPuKItTAmbHQ7QSZsdDs8aW1nIHdpZHRoPTI1IGhlaWdodD0yMSBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzY3L0QxL3JCQUNFMU1zQ0k2RDdlMUhBQUFCWkFxVVZDWTk3Ni5wbmciPiziiLQ8aW1nIHdpZHRoPTI3IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzQ0LzI4L3JCQUNGRk1zQ0k2VGRHR3JBQUFCcVdCQW9RVTQwOS5wbmciPiZndDs8aW1nIHdpZHRoPTE5IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzY3L0QxL3JCQUNFMU1zQ0k3eTdrUS1BQUFCYmlhOFpnTTEyMS5wbmciPiwg4oi0PGltZyB3aWR0aD04OSBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC82Ny9EMS9yQkFDRTFNc0NJNkF2aDY5QUFBQ0wySXdkOVk2MDkucG5nIj4=
4/5单选题
难度：
4.
，(
)(
=2,AB=2, 则
面积S的最大值为
| A |
|
| B | 4-2 |
| C | 2 |
| D |
|
- 提示1：
- PHA+5L2Z5bym5a6a55CGPC9wPg==
- 提示2：
- PHA+5Z+65pys5LiN562J5byPPC9wPg==
- 提示3：
- PHA+6Z2i56ev5YWs5byPPC9wPg==
正确答案：QQ==
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
5/5单选题
难度：
5.在∆ABC中， (cosB+cosC)=b+c.若 ∆ABC的外接圆半径为1，则∆ABC周长
的最大值是
(cosB+cosC)=b+c.若 ∆ABC的外接圆半径为1，则∆ABC周长的最大值是 | A | 4+ |
| B | 2+ |
| C | 2- |
| D | 2+2 |
- 提示1：
- IOato+W8puWumueQhg==
- 提示2：
- IOS9meW8puWumueQhuWMlui+uQ==
- 提示3：
- IOWfuuacrOS4jeetieW8j++8mmIrYzxpbWcgd2lkdGg9NzEgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvNDQvMjkvckJBQ0ZGTXNDSldnbU9obkFBQUNrMWxqYmhNNTA0LnBuZyI+
正确答案：RA==
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