Mathematics
Senior High
(3)教えてください
□ 72 次の和Sを求めよ。
(1)
*(2)
S=1·1+3·2+5•2²+...+(2n-1) 2²-1
S=5·1+9∙3+13·3²+......+(4n+1)∙3″−1
S=1+4x+7x²+...+(3n-2)x"-1
B Clear I
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