1/5单选题
难度：
1.
解三元一次方程组
（ ）
| A | 无解 |
| B | 有1组解 |
| C | 有2组解 |
| D | 有无穷多组解 |
- 提示1：
- PHA+6L+Q55So5Yqg5YeP5raI5YWD5rOVPC9wPg==
- 提示2：
- 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
- 提示3：
- PHA+5LiO4pGi5b2i5oiQ5paw55qE5pa556iL57uEPC9wPg==
正确答案：QQ==
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
2/5单选题
难度：
2.
解方程组
时，第一次消去未知数的最佳方法是（ ）
| A | 加减法消去 |
| B | 加减法消去 |
| C | 加减法消去 |
| D | 代人法消去 |
，将①-③×3与②-③×2
，将①+③与①×3+②
，将①+②与③+②
中的任何一个- 提示1：
- PHA+6KeC5a+f5pa556iL57O75pWw77yMeueahOezu+aVsOebuOWQjO+8jOaIluS6kuS4uuebuOWPjeaVsO+8mzxicj48L3A+
- 提示2：
- PHA+6YCJ5Y+W5ZCI6YCC55qE5raI5YWD5rOV77yb57O75pWw5LqS5Li655u45Y+N5pWw77yM5oiW5pyJ5YCN5pWw5YWz57O777yM55u45ZCM77yM6YCJ55So5Yqg5YeP5raI5YWD5rOV77ybPGJyPjwvcD4=
- 提示3：
- PHA+5bCG4pGgK+KRoeS4juKRoivikaHlj6/ku6Xmtojljrt6PGJyPjwvcD4=
正确答案：Qw==
PGRpdj7op6PvvJrmlrnnqIvnu4Q8aW1nIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvRjMvMDEvckJBQ0ZGTUhVYmFSRHQ1NkFBQUZ3ekU0T3ZZMTk1LnBuZyIgZGF0YS1ja2Utc2F2ZWQtc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC9GMy8wMS9yQkFDRkZNSFViYVJEdDU2QUFBRnd6RTRPdlkxOTUucG5nIiBoZWlnaHQ9IjgzIiB3aWR0aD0iMTMyIj7ml7bvvIznrKzkuIDmrKHmtojljrvmnKrnn6XmlbDnmoTmnIDkvbPmlrnms5XmmK/vvJo8L2Rpdj48ZGl2PueUqOKRoCvikaHkuI7ikaIr4pGh5YWI5raI5Y67PGltZyBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwL0YzLzAxL3JCQUNGRk1IVWJhU2Z6bFlBQUFCQTJvWnZiazEzOC5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvRjMvMDEvckJBQ0ZGTUhVYmFTZnpsWUFBQUJBMm9admJrMTM4LnBuZyIgaGVpZ2h0PSIyMSIgd2lkdGg9IjciPu+8jOW+l+WIsDxpbWcgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC9GMy8wMS9yQkFDRkZNSFViYlFTaEZUQUFBRDVHRzE0RlE0MjcucG5nIiBkYXRhLWNrZS1zYXZlZC1zcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwL0YzLzAxL3JCQUNGRk1IVWJiUVNoRlRBQUFENUdHMTRGUTQyNy5wbmciIGhlaWdodD0iNjIiIHdpZHRoPSIxMTIiPu+8mzwvZGl2PjxkaXY+5Yip55SoPGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzE1L0MyL3JCQUNFMU1IVWJiQ1VsTWRBQUFCdjE4UnVvVTUzNC5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMTUvQzIvckJBQ0UxTUhVYmJDVWxNZEFBQUJ2MThSdW9VNTM0LnBuZyIgaGVpZ2h0PSIyMSIgd2lkdGg9IjY5Ij7lvpc8aW1nIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMTUvQzIvckJBQ0UxTUhVYmFEZWUzY0FBQUJYWFFKLW9NMDcyLnBuZyIgZGF0YS1ja2Utc2F2ZWQtc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8xNS9DMi9yQkFDRTFNSFViYURlZTNjQUFBQlhYUUotb00wNzIucG5nIiBoZWlnaHQ9IjIxIiB3aWR0aD0iMzQiPjs8L2Rpdj48ZGl2PuWwhjxpbWcgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8xNS9DMi9yQkFDRTFNSFViYURlZTNjQUFBQlhYUUotb00wNzIucG5nIiBkYXRhLWNrZS1zYXZlZC1zcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzE1L0MyL3JCQUNFMU1IVWJhRGVlM2NBQUFCWFhRSi1vTTA3Mi5wbmciIGhlaWdodD0iMjEiIHdpZHRoPSIzNCI+5Luj5YWlPGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwL0YzLzAxL3JCQUNGRk1IVWJiaGxYZmdBQUFBeXpIRHMxNDg3OS5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvRjMvMDEvckJBQ0ZGTUhVYmJobFhmZ0FBQUF5ekhEczE0ODc5LnBuZyIgaGVpZ2h0PSIyMSIgd2lkdGg9IjE0Ij7lvpc8aW1nIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvRjMvMDEvckJBQ0ZGTUhVYmJUX3ZjWUFBQUJleDZ1UkdFODIyLnBuZyIgZGF0YS1ja2Utc2F2ZWQtc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC9GMy8wMS9yQkFDRkZNSFViYlRfdmNZQUFBQmV4NnVSR0U4MjIucG5nIiBoZWlnaHQ9IjIxIiB3aWR0aD0iMzQiPu+8mzwvZGl2PjxkaXY+5bCGPGltZyBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzE1L0MyL3JCQUNFMU1IVWJiUkZYZ1BBQUFCNVhvclNxRTkyNy5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMTUvQzIvckJBQ0UxTUhVYmJSRlhnUEFBQUI1WG9yU3FFOTI3LnBuZyIgaGVpZ2h0PSIyMSIgd2lkdGg9IjgyIj7ku6PlhaXikaDlvpc8aW1nIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvRjMvMDEvckJBQ0ZGTUhVYmJqWGlWMEFBQUJQVDZZMDlROTAxLnBuZyIgZGF0YS1ja2Utc2F2ZWQtc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC9GMy8wMS9yQkFDRkZNSFViYmpYaVYwQUFBQlBUNlkwOVE5MDEucG5nIiBoZWlnaHQ9IjIxIiB3aWR0aD0iMzMiPiw8L2Rpdj48ZGl2PuKItOWOn+aWueeoi+e7hOeahOino+S4ujxpbWcgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8xNS9DMi9yQkFDRTFNSFViYlRuc0pLQUFBQ3hXdGRQY1E3MjIucG5nIiBkYXRhLWNrZS1zYXZlZC1zcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzE1L0MyL3JCQUNFMU1IVWJiVG5zSktBQUFDeFd0ZFBjUTcyMi5wbmciIGhlaWdodD0iNjIiIHdpZHRoPSI0MyI+PC9kaXY+
3/5单选题
难度：
3.
三元一次方程组
的解是（ ）
| A |
|
| B |
|
| C |
|
| D |
|
- 提示1：
- PHA+5YWI55So4pGgLeKRoeW+lzxpbWcgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8xNS9DMi9yQkFDRTFNSFVicXh4Si1mQUFBQnZqSDl2aDg5NTIucG5nIiBkYXRhLWNrZS1zYXZlZC1zcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzE1L0MyL3JCQUNFMU1IVWJxeHhKLWZBQUFCdmpIOXZoODk1Mi5wbmciIGhlaWdodD0iMjEiIHdpZHRoPSI1OCI+4pGjPC9wPg==
- 提示2：
- 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
- 提示3：
- 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
正确答案：Qw==
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
4/5单选题
难度：
4.
如果方程组
的解使代数式
的值为10，那么
=（ ）
| A | 3 |
| B |
|
| C |
|
| D |
|
- 提示1：
- PHA+5pa556iL57uE5Lit5YmN5Lik5Liq5pa556iL55u45YeP5raI5Y67eeW+l+WIsHjkuI5655qE5pa556iLPC9wPg==
- 提示2：
- PHA+5LiO56ys5LiJ5Liq5pa556iL6IGU56uL5rGC5Ye6euS4jnjnmoTlgLzvvIzov5vogIzmsYLlh7p555qE5YC8PC9wPg==
- 提示3：
- PHA+5bCGeO+8jHnlj4p655qE5YC85Luj5YWl5bey55+l55qE562J5byP5Lit77yM5Y2z5Y+v5rGC5Ye6a+eahOWAvC48L3A+
正确答案：Qg==
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
5/5单选题
难度：
5.
解关于
方程组
的解为（ ）
| A |
|
| B |
|
| C |
|
| D |
|
- 提示1：
- PHA+5YWI5oqK5pa556iL4pGg5LmY5LulMu+8jOWGjeS4juaWueeoi+KRoeebuOWHj++8jOW+l+WIsOWFs+S6jjxpbWcgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8xNS9DMy9yQkFDRTFNSFVjaURmcHNpQUFBQlhrOTlMVFE0NzkucG5nIiBkYXRhLWNrZS1zYXZlZC1zcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzE1L0MzL3JCQUNFMU1IVWNpRGZwc2lBQUFCWGs5OUxUUTQ3OS5wbmciIGhlaWdodD0iMjEiIHdpZHRoPSIyNyI+55qE5pa556iL77yMPC9wPg==
- 提示2：
- 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
- 提示3：
- 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
正确答案：RA==
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