Sequences & Series (id: cc313ce74)

本题目来源于试卷: Sequences & Series，类别为 IB数学

[填空题]
In an arithmetic sequr3awmw3+ vzwi 6*x sx)ence-rh:.b;y nex*sl /t4e ct.. 5htdppsn, $u_{5}=24$, $u_{13}=80$ .
1. Find the common difference.   
2. Find the first term.   
3. Find the sum of the first 20 terms in the sequence.   

参考答案:
空格1: 7±2%  空格2: -4±2%  空格3: 1250±2% 


本题详细解析:

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