1/5单选题
难度：
1..下列方程中，不能用直接开平方法的是（）
| A |  |
| B |  |
| C |  |
| D |  |
- 提示1：
- 5b2i5aaCPGltZyB3aWR0aD01MSBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC9BQS8yOS9yQkFDRkZUSW1xendlc0JWQUFBQjBYV09ROE03NDkucG5nIj49YueahOW9ouW8j++8jOaJjeiDveeUqOebtOaOpeW8gOW5s+aWueazleino+aWueeoiw==
正确答案：Qw==
6Kej562U77ya4oi1Qy4gPGltZyB3aWR0aD03NiBoZWlnaHQ9MjIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC83My8xRi9yQkFDRTFUSW1xenhQcC1NQUFBQ0l2ZGtNR0kxMzcucG5nIj7kuI3mmK/lrozlhajlubPmlrnnmoTlvaLlvI/vvIzmiYDku6XkuI3og73nlKjnm7TmjqXlvIDmlrnms5Xop6PmlrnnqIs8YnI+5pWF6YCJQzxicj4=
2/5单选题
难度：
2.下列说法中正确的是（）
| A | 方程 两边开平方，得原方程的解为 |
| B |  是方程 的根，所以得根是 |
| C | 方程 的根是 |
| D | 方程 有两个相等的根 |
- 提示1：
- 5b2i5aaCPGltZyB3aWR0aD01MSBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC9BQS8yOS9yQkFDRkZUSW1xendlc0JWQUFBQjBYV09ROE03NDkucG5nIj49YueahOW9ouW8j++8jOW9k2LkuLrmraPmlbDml7bvvIzmraTmlrnnqIvmnInkuKTkuKrkuI3nm7jnrYnnmoTmoLnvvIzlvZNiPTDml7bvvIzmnInkuKTkuKrnm7jnrYnnmoTmoLnvvIzlvZNi5Li66LSf5pWw5pe277yM5pa556iL5peg6Kej
正确答案：Qw==
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
3/5单选题
难度：
3.已知
，方程
的解是_____
，方程的解是_____ | A |  |
| B |  |
| C |  |
| D |  |
- 提示1：
- 5LiA5Liq5q2j5pWw55qE5bmz5pa55qC55pyJ5Lik5Liq77yM5LiU5LqS5Li655u45Y+N5pWw
正确答案：Qw==
6Kej562U77ya4oi1PGltZyB3aWR0aD0xMTAgaGVpZ2h0PTIyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvQUEvMjkvckJBQ0ZGVEltck96a2wxNUFBQUM3SFNPSWh3ODI3LnBuZyI+PGJyPuKItDxpbWcgd2lkdGg9OTYgaGVpZ2h0PTYyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvNzMvMUYvckJBQ0UxVEltclBSaDBiN0FBQUM4aTlOVWtZNDkzLnBuZyI+PGJyPuKItDxpbWcgd2lkdGg9NjAgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvM0UvRTkvckJBQ0oxVEltclBDYkoyVUFBQUNtSkwyZkxzMDcwLnBuZyI+PGJyPuaVhemAiUM=
4/5单选题
难度：
4.方程
的根为_____
的根为_____ | A |  |
| B |  |
| C |  |
| D |  |
- 提示1：
- PGltZyB3aWR0aD00MCBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC9BQS8yOS9yQkFDRkZUSW1yYVRnbmwzQUFBQmh3NDZBSkUxOTYucG5nIj4s5b2TYeS4uuato+aVsOaXtu+8jHg9PGltZyB3aWR0aD0yOCBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8zRS9BQi9yQkFDSmxUSW1yYmh4RXduQUFBQm5zMUh4OUE1NjQucG5nIj4=
正确答案：Qw==
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
5/5单选题
难度：
5.若
，则
得值等于_____
，则得值等于_____ | A |  |
| B |  |
| C | 0或2 |
| D | 0或-2 |
- 提示1：
- 5b2i5aaCPGltZyB3aWR0aD01MSBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC9BQS8yOS9yQkFDRkZUSW1xendlc0JWQUFBQjBYV09ROE03NDkucG5nIj49YueahOW9ouW8j++8jOW9k2LkuLrmraPmlbDml7bvvIzmraTmlrnnqIvmnInkuKTkuKrkuI3nm7jnrYnnmoTmoLksPGltZyB3aWR0aD03NyBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC9BQS8yOS9yQkFDRkZUSW1ybmkwV1czQUFBQ0VuWlRhQms3NTgucG5nIj4=
正确答案：RA==
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