1/3单选题
难度：
1.若数列{bn}的通项公式为bn=n2•2n，则其前n项和Tn=（ ）
| A | （n2-2n+3）•2n+1 |
| B | （n2-2n+3）•2n-6 |
| C | （n2-2n+3）•2n+1-6 |
| D | （n2-2n+3）•2n+1+6 |
正确答案：Qw==
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
