Mathematics
Senior High
この赤で囲ってある答えを導き出す途中式がわかりません。
(2)初項 2, 公比 - 13 の等比数列であるから
S
2{1-(-1/2)*}_6{1-(-1)*}
2
1
3
1-(-1))
3(1+1/3)
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![(2)[1]の式はなぜこうなるのでしょうか？
解説お願いします🙏🏻 - 1](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1810073/thumb_l_webp_1717B3E3-8A84-49A5-82D1-466207496D96.webp?Expires=1787240183&Signature=ZyG5IOQMJ0Pxf0xxcubDvsmrNBRTMnO2BH1pYwIKUd2UFX561-ZeLVez5aAJvAbBKnX4Ti3M0dEvEQfYG6Jg9b5rtowWUwrp~Ig6mR4k4QupqC01nUdfx0e~pYubQhb6Qs-kRQAvt4CNUDg1kXb7r5QAHFTRb6fYTiCu3xG6cIQlyQcadCGaeGGyrJhZkUIzaRMNQDnqZn4LHcu~ufAe1X1HVNNGK0Gbt-3Br-PkOvlOKRJf8Uid6FSWgULnYojbi1yGaKqzaUhzEVriKv3cVPPBYdwXF90FS7X7G1iRj2Xn0PrAa~yODbYfr9R4Unrm~5xTwKYS03ksSMdnVcGl3g__&Key-Pair-Id=K2W722D70GJS8W&Expires=1787240183&Signature=I2mi7xV6ZZaAUuShqdrJt~IN7YSW7helbVhFeGk-i6BYPfJ39tcTvpDrWsNe~YHr~NqxdtLtNBUB119GrBVkVSVBhOXprqkqvvRpMVYYZKIIBvSXXgBcHJBBRg3KnwdIUQx8zoGtgfnTqtE1fBVcL~Evp5Wr8cbRmZZtZ30Muybkfa5-6wNWddW-II7VNrKCaHMNhpxt8z0CJUO0ZTIaEdE2GhG6j7Zfu5lvrtj4Z296G2liQzL3aUMQ3Xb56bec-2cXr7Ov0-B0FzKy7N7OpOavR1jXq1oZtRO2lvRU37nP5wRNL0yax-8mpUFl-LwvPTESHuAWoe1IbgTEpVEQcw__&Key-Pair-Id=K2W722D70GJS8W)
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