Mathematics
Senior High
どこでミスしているのか分からないのですがどなたか教えていただけませんか？
x=1のとき、
( 1 − X ) S = 1 +
IX (1-2¹)-(3N-2 ) An
1-9
(1-X) + 3X (1-x²-¹)-(1-x) (3N-2) X^
1-2
30-2-3n+20
(1-2) + 30-32²-(1-2) (30-2120"
1-X
S = 1 + 2/(1-2 1²
(1-201²
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