Mathematics
Senior High
2行目の展開を詳しく教えてください！
(4)階差数列は,-2, 4, -8, 16,
138-1+
(-2)”だから,
9
-2{(-2)"ー1-1}
n-1
an=1+2(-2)*=1+
-2-1
k=1
n-1
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