15问答网 > 已知数列{an}的通项公式为an= （-1）的n+1次方乘以(3n-2),写出数列的第5项和第100项

已知数列{an}的通项公式为an= （-1）的n+1次方乘以(3n-2),写出数列的第5项和第100项

2025-04-02 06:49:55
推荐回答（4个）
回答1：

答案 当n=5时n+1=6故(-1)(n+1)=1 所以a5=13 以此类推 a100=298

回答2：

代数呗！，a5=（-1）4（3*5-2）=13a100=（-1）101（3*100-2）=-298

回答3：

把n=5和100代进去不就行了么？

回答4：

13 298

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