1/5单选题
难度：
1.下列长度的三条线段，能组成等腰三角形的是（ ）
| A | 1,1,2 |
| B | 2,2,5 |
| C | 3,3,5 |
| D | 3,4,5 |
- 提示1：
- 5Yip55So562J6IWw5LiJ6KeS5b2i55qE5oCn6LSo5ZKM5LiJ6KeS5b2i55qE5Lik6L655LmL5ZKM5aSn5LqO56ys5LiJ6L65
正确答案：Qw==
6Kej77yaQeWSjELpg73kuI3og73mnoTmiJDkuInop5LlvaLvvIxE562U5qGI5LiN5piv562J6IWw5LiJ6KeS5b2iPGJyPuKItOmAiUM=
2/5单选题
难度：
2.在△ABC中，∠A，∠B，∠C对应的边分别为a。b，c，给出下列条件，不能判定其为等腰三角形的是（ ）
| A | ∠A：∠B：∠C=1：1：3 |
| B | a：b：c=2:2:3 |
| C | ∠B=50°，∠C=80° |
| D | 2∠A=∠B+∠C |
- 提示1：
- 5Yip55So562J6IWw5LiJ6KeS5b2i55qE5a6a5LmJ5ZKM5Yik5a6a5a6a55CG5Yik5pat
正确答案：RA==
6Kej77yaQe+8muKIoEE94oigQuetieiFsOS4ieinkuW9ojxicj5C77yaYT1i562J6IWw5LiJ6KeS5b2iPGJyPkPvvJrnlLHlhoXop5LlkozlrprnkIblj6/lvpfiiKBBPeKIoEIgPTUwwrA8YnI+RO+8mumUmeivrw==
3/5单选题
难度：
3.如图，在△ABC中， AB=AC，∠A=36°，BD、CE分别是∠ABC、∠BCD的角平分线，则图中的等腰三角形有（）
| A | 5个 |
| B | 4个 |
| C | 3个 |
| D | 2个 |
- 提示1：
- 5qC55o2u5bey55+l5p2h5Lu25ZKM562J6IWw5LiJ6KeS5b2i55qE5Yik5a6a5a6a55CG77yM5a+55Zu+5Lit55qE5LiJ6KeS5b2i6L+b6KGM5YiG5p6Q77yM5Y2z5Y+v5b6X5Ye6562U5qGI77yO
正确答案：QQ==
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
4/5单选题
难度：
4.平面直角坐标系中，已知A（8,0），△AOP为等腰三角形且面积为16，满足条件的P点的个数是（ ）
| A | 4 |
| B | 8 |
| C | 10 |
| D | 12 |
- 提示1：
- 6ICD6JmR5Lik56eN5oOF5Ya1T0HkuLrlupXovrnmiJZPQeS4uuiFsA==
正确答案：Qw==
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
5/5单选题
难度：
5.如图所示，在等边三角形ABC中，O是三个内角平分线的交点，OD∥AB，OE∥AC，则图中等腰三角形的个数是（）
| A | 7 |
| B | 6 |
| C | 5 |
| D | 4 |
- 提示1：
- 5qC55o2u6aKY5Lit5p2h5Lu277yM57uT5ZCI5Zu+5b2i5Y+v5b6X4pazQUJD77yM4pazQU9C77yM4pazQU9D77yM4pazQk9E77yM4pazRE9F77yM4pazQ09F77yM4pazQk9D5YWxN+S4quetieiFsOS4ieinkuW9ou+8jg==
正确答案：QQ==
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