1/5单选题
难度：
1.
若数列{
n}是一个以d为公差的等差数列，bn=2n+3（n∈N*），则数列{bn}是（ ）
| A | 公差为d的等差数列 |
| B | 公差为2d的等差数列 |
| C | 公差为3d的等差数列 |
| D | 公差为2d+3的等差数列 |
- 提示1：
- PHA+55Sx6aaW6aG55ZKM5YWs5beu77yM5Yip55So562J5beu5pWw5YiX55qE6YCa6aG55YWs5byP5Y+v5Yik5patPC9wPg==
正确答案：Qg==
PHA+6Kej77ya55Sx6aKY5oSP77yMYjxzdWI+bisxPC9zdWI+LWI8c3ViPm48L3N1Yj49Mu+8iDxpbWcgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC84MC9EMC9yQkFDRTFNMU53U1NjSUQ0QUFBQkhIWU1sa2s4MzQucG5nIiBkYXRhLWNrZS1zYXZlZC1zcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzgwL0QwL3JCQUNFMU0xTndTU2NJRDRBQUFCSEhZTWxrazgzNC5wbmciIGhlaWdodD0iMTYiIHdpZHRoPSIxNCI+PHN1Yj5uKzE8L3N1Yj4tPGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzgwL0QwL3JCQUNFMU0xTndTU2NJRDRBQUFCSEhZTWxrazgzNC5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvODAvRDAvckJBQ0UxTTFOd1NTY0lENEFBQUJISFlNbGtrODM0LnBuZyIgaGVpZ2h0PSIxNiIgd2lkdGg9IjE0Ij48c3ViPm48L3N1Yj7vvIk9MmTvvIziiLTmlbDliJd7YjxzdWI+bjwvc3ViPn3mmK/lhazlt67kuLoyZOeahOetieW3ruaVsOWIl++8jDxicj7mlYXpgIlCLjwvcD4=
2/5单选题
难度：
2.已知等差数列{n}中， 1=3， 6=13，则该等差数列的公差为（ ）
n}中， 1=3， 6=13，则该等差数列的公差为（ ） | A |  |
| B | 2 |
| C | 10 |
| D | 13 |
- 提示1：
- IOeUseetieW3ruaVsOWIl+eahOmAmumhueWFrOW8j+WPr+W+lzogPGltZyB3aWR0aD0xNCBoZWlnaHQ9MTYgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC84MC9EMC9yQkFDRTFNMU53U1NjSUQ0QUFBQkhIWU1sa2s4MzQucG5nIj48c3ViPjY8L3N1Yj49PGltZyB3aWR0aD0xNCBoZWlnaHQ9MTYgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC84MC9EMC9yQkFDRTFNMU53U1NjSUQ0QUFBQkhIWU1sa2s4MzQucG5nIj48c3ViPjE8L3N1Yj4rNWQ9MTM=
正确答案：Qg==
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
3/5单选题
难度：
3.下列条件中，不能判断数列{n}是等差数列的是（ ）
n}是等差数列的是（ ） | A | n+1-n=n（n∈N*） |
| B | 2n+1=n+n+2（n∈N*） |
| C | sn=n2（sn为{n}的前n项和） |
| D | n=5（n∈N*） |
- 提示1：
- IOeUseetieW3ruaVsOWIl+eahOWIpOaWreaWueazle+8jOmAkOS4qumqjOivgeWPr+W+ly4=
正确答案：QQ==
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
4/5单选题
难度：
4.已知等差数列{n}中， 7+9=10， 4=1，则12的值是（ ）
n}中， 7+9=10， 4=1，则12的值是（ ） | A | 15 |
| B | 11 |
| C | 10 |
| D | 9 |
- 提示1：
- IOebtOaOpeeUseetieW3ruS4remhueeahOaAp+i0qOWIl+W8j+axguinow==
正确答案：RA==
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
5/5单选题
难度：
5.若{
}是等差数列，则有下列关系确定的数列{
}也一定是等差数列的是（ ）
}是等差数列，则有下列关系确定的数列{}也一定是等差数列的是（ ） | A | bn=n2 |
| B | bn=n+n2 |
| C | bn=n+n+1 |
| D | bn=nn |
- 提示1：
- IOWPljxpbWcgd2lkdGg9OCBoZWlnaHQ9MjEgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC84MC9EMS9yQkFDRTFNMU54TFFFT0NxQUFBQkgwOWJrQ0kzOTcucG5nIj48c3ViPm48L3N1Yj48aW1nIHdpZHRoPTMgaGVpZ2h0PTIxIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvODAvRDEvckJBQ0UxTTFOeEx5RUpVWkFBQUFxRER2V0t3NDc4LnBuZyI+PW7vvIzlj6/liKTlrprpgInpoblB44CBQuOAgUTnmoTnnJ/lgYc=
- 提示2：
- IOWIqeeUqOetieW3ruaVsOWIl+eahOWumuS5ieWIpOWumg==
正确答案：Qw==
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