Sequences & Series (id: 60ce8c1b4)

本题目来源于试卷: Sequences & Series，类别为 IB数学

[填空题]
In an arithmetic seqt, )m+9cr8y b ph;iy,:rmfcoduence,5s jy)7 , c atlmxncxw3r9u;3w $u_{4}=12$, $u_{11}=-9$ .
1. Find the common difference.   
2. Find the first term.   
3. Find the sum of the first 11 terms in the sequence.   

参考答案:
空格1: -3±2%  空格2: 21±2%  空格3: 66±2% 


本题详细解析:

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