Câu hỏi của Yoriichi Tsugikuni

Question

Cho P = 8 + 82 + 83 + ... + 82021. Tìm y biết 7P + 8 = 8y

Bình Minh · Accepted Answer

`8P = 8 . (8+8^2+...+8^2021)``8P = 8^2 + 8^3 + ... + 8^2022``8P - P = (8+8^2+8^3+...+8^2022) - (8+8^2+...+8^2021)``7P = 8^2022 - 8`.`-> 7P + 8 = 8^2022``-> y = 2022`.Câu trả lời: `8P = 8 . (8+8^2+...+8^2021)``8P = 8^2 + 8^3 + ... + 8^2022``8P - P = (8+8^2+8^3+...+8^2022) - (8+8^2+...+8^2021)``7P = 8^2022 - 8`.`-> 7P + 8 = 8^2022``-> y = 2022`.

Lê Diệu Linh · Answer

⇒ 8 P = 8 2 + 8 3 + . . . + 8 2022 ⇒ 8 P − P = 8 2 + 8 3 + . . . + 8 2022 − 8 − 8 2 − . . . − 8 2021 ⇒ 7 P = 8 2022 − 8    7 P + 8 = 8 y⇒ 8 2022 − 8 + 8 = 8 y⇒ 8 2022 = 8 y⇒ y = 2022Câu trả lời:  ⇒ 8 P = 8 2 + 8 3 + . . . + 8 2022 ⇒ 8 P − P = 8 2 + 8 3 + . . . + 8 2022 − 8 − 8 2 − . . . − 8 2021 ⇒ 7 P = 8 2022 − 8    7 P + 8 = 8 y⇒ 8 2022 − 8 + 8 = 8 y⇒ 8 2022 = 8 y⇒ y = 2022

minh · Answer

8P=8.(8+82+...+82021)8P=8.(8+82+...+82021)8P=82+83+...+820228P=82+83+...+820228P−P=(8+82+83+...+82022)−(8+82+...+82021)8P-P=(8+82+83+...+82022)-(8+82+...+82021)7P =82022−87P =82022-8.→7P+8=82022→7P+8=82022→y=2022→y=2022.  Câu trả lời: 8P=8.(8+82+...+82021)8P=8.(8+82+...+82021)8P=82+83+...+820228P=82+83+...+820228P−P=(8+82+83+...+82022)−(8+82+...+82021)8P-P=(8+82+83+...+82022)-(8+82+...+82021)7P =82022−87P =82022-8.→7P+8=82022→7P+8=82022→y=2022→y=2022.

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