Mathematics
Senior High
数学の問題なんですけど、分からなくて教えて欲しいです。
お願いします。至急です。
(１)∑k＝１のn(4k-5)
(２)∑k＝１のn(3kの二乗-7k+4)
(３)∑k＝１のn(kの三乗+k)
(４)∑k＝１のn-1(2kの三乗)
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