Mathematics
Senior High

どのようにといたら良いのでしょか⁇
どこから解いたたら良いかわかりません
式と答えもおねがいします
右下が答えです

初項4, 末項 -972, 項数6 (公比は実数) - 728 公比2, 末項 4096, 項数 10 8184
数b 等差数列

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