1/5单选题
难度：
1.方程3x+4y=12的非负整数解共有（ ）组
| A | 1 |
| B | 2 |
| C | 3 |
| D | 4 |
- 提示1：
- IOeugOWNleaemuS4vuazlQ==
正确答案：Qg==
PGRpdj7op6Plvpc8aW1nIHdpZHRoPTM5IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzIzLzVEL3JCQUNFMU1NV2ozUTZjRTdBQUFDSDIzWlRDWTk2NS5wbmciPu+8jDxpbWcgd2lkdGg9MzkgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMDAvNkQvckJBQ0ZGTU1XajJnSi1HcUFBQUNKeXFQT0E0NDAwLnBuZyI+PC9kaXY+
2/5单选题
难度：
2.二元一次方程2x+5y=17的非负整数解的个数为（ ）
| A | 0 |
| B | 1 |
| C | 2 |
| D | 3 |
- 提示1：
- IOimgeaxguS6jOWFg+S4gOasoeaWueeoizJ4KzV5PTE355qE6Z2e6LSf5pW05pWw6Kej77yM5Y+v5YWI5LuOeT0w5byA5aeL77yM5YiG5Yir5oqKeT0w77yMMe+8jDLvvIwz77yMNOS7o+WFpeaWueeoi++8jOaxguWHuuWvueW6lOeahHnnmoTlgLzvvIznhLblkI7ov5vooYzliKTmlq0=
正确答案：Qw==
PGRpdj7op6PvvJrlj6rmnInlvZN5PTHvvIzliJkyeCs1PTE377yM6Kej5b6XeD0277yb5b2TeT0z77yM5YiZMngrMTU9MTfvvIzop6Plvpd4PTE8L2Rpdj48ZGl2PuKItOmAiUM8L2Rpdj4=
3/5单选题
难度：
3.
若关于x，y的方程组
的解是一对正数，则整数a的值为（）
| A | 2，3，4，5 |
| B | 2，3，4 |
| C | 4，5 |
| D | 3，4 |
- 提示1：
- 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
正确答案：RA==
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
4/5单选题
难度：
4.
已知n是奇数，m是偶数，方程组
有整数解x0，y0，则（ ）
| A | x0，y0均为偶数 |
| B | x0，y0均为奇数 |
| C | x0是偶数，y0是奇数 |
| D | x0是奇数，y0是偶数 |
- 提示1：
- PHA+6L+Q55SobuaYr+Wlh+aVsO+8jG3mmK/lgbbmlbDvvIzliIbmnpDmlrnnqIvnmoTlpYflgbbmgKfvvIzku47ogIznoa7lrpp4PHN1Yj4wPC9zdWI+77yMeTxzdWI+MDwvc3ViPueahOWlh+WBtuaApzwvcD4=
正确答案：Qw==
PGRpdj7op6PvvJriiLUyMDA0K3k9bu+8jG7kuLrlpYfmlbDvvIwyMDA05Li65YG25pWw77yM5pWFeeW/heS4uuWlh+aVsCDljbN5PHN1Yj4wPC9zdWI+5Li65aWH5pWw77ybPGJyPuKItTExeCsyOHk9be+8jG3kuLrlgbbmlbDvvIwyOHnkuLrlgbbmlbDvvIw8YnI+4oi0MTF45b+F5Li65YG25pWw77yMeOS4uuWBtuaVsO+8jOWNs3g8c3ViPjA8L3N1Yj7kuLrlgbbmlbAuPGJyPuKItHg8c3ViPjA8L3N1Yj7kuLrlgbbmlbDvvIx5PHN1Yj4wPC9zdWI+5Li65aWH5pWwLjxicj7mlYXpgInvvJpDLjxicj48L2Rpdj4=
5/5单选题
难度：
5.
关于x的方程||x-2|-1|=a恰有三个整数解，则a的值为（ ）
| A | 1 |
| B | 2 |
| C | 3 |
| D | 3 |
- 提示1：
- PHA+5qC55o2u57ud5a+55YC855qE5oCn6LSo5Y+v5b6XfHgtMnwtMT3CsWHvvIznhLblkI7orqjorrp44omlMuWPinjvvJwy55qE5oOF5Ya15LiL6Kej55qE5oOF5Ya177yM5YaN5qC55o2u5pa556iL5pyJ5LiJ5Liq5pW05pWw6Kej5Y+v5b6X5Ye6YeeahOWAvC48L3A+
正确答案：QQ==
PGRpdj7op6PvvJrikaDoi6V8eC0yfC0xPWHvvIw8YnI+5b2TeOKJpTLml7bvvIx4LTItMT1h77yM6Kej5b6X77yaeD1hKzPvvIxh4omlLTHvvJs8YnI+5b2TeO+8nDLml7bvvIwyLXgtMT1h77yM6Kej5b6X77yaeD0xLWHvvJth77yeLTHvvJs8YnI+4pGh6IulfHgtMnwtMT0tYe+8jDxicj7lvZN44omlMuaXtu+8jHgtMi0xPS1h77yM6Kej5b6X77yaeD0tYSsz77yMYeKJpDHvvJs8YnI+5b2TeO+8nDLml7bvvIwyLXgtMT0tYe+8jOino+W+l++8mng9YSsx77yMYe+8nDHvvJs8YnI+5Y+I4oi15pa556iL55qE5LiJ5Liq6Kej6YO95piv5pW05pWw77yM5omA5LulYeS5n+aYr+aVtOaVsOOAgjxicj7iiLTlj6/lvpfvvJphPS0x5oiWMe+8jOagueaNrue7neWvueWAvOeahOmdnui0n+aAp+WPr+W+l++8mmHiiaUwLjxicj7ljbNh5Y+q6IO95Y+WMS48YnI+PC9kaXY+PGRpdj7iiLTpgIlBPC9kaXY+