Mathematics
Senior High
Solved
この式変形のやり方を教えてください🙇♀️
1
S=½½(2n − 1)[(2(n² −2n+2)+{(2n − 1)−1}• 1]
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= (2n − 1)(n² — n+1)
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1/2は(2n-1)にはかけなくて良いということですか?