Sn=(a-1)+(a²-2)+(a³-3)……+(a的n次方-n)QUQ求解多谢
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![Sn=(a-1)+(a²-2)+(a³-3)……+(a的n次方-n)QUQ求解多谢](/uploads/image/z/1087359-15-9.jpg?t=Sn%3D%28a%EF%BC%8D1%29%2B%EF%BC%88a%26%23178%3B-2%EF%BC%89%2B%EF%BC%88a%26%23179%3B-3%EF%BC%89%E2%80%A6%E2%80%A6%2B%EF%BC%88a%E7%9A%84n%E6%AC%A1%E6%96%B9-n%EF%BC%89QUQ%E6%B1%82%E8%A7%A3%E5%A4%9A%E8%B0%A2)
Sn=(a-1)+(a²-2)+(a³-3)……+(a的n次方-n)QUQ求解多谢
Sn=(a-1)+(a²-2)+(a³-3)……+(a的n次方-n)
QUQ求解多谢
Sn=(a-1)+(a²-2)+(a³-3)……+(a的n次方-n)QUQ求解多谢
相当于一个等比数列减去一个等差数列,套各自求和公式就可以了
相当于一个等比数列减去一个等差数列,套各自求和公式就可以了