1/2 + (1/2)^2 +(1/2)^3 +….+ (1/2)^36

Question

1/2 + (1/2)^2 +(1/2)^3 +….+ (1/2)^36

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Huy Gia 5 years 2020-12-01T08:51:08+00:00 2 Answers 92 views 0

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  1. minhkhoi
    0
    2020-12-01T08:52:31+00:00
    Reply

    Đáp án:

     

    Giải thích các bước giải:

     Đặt `A=1/2 + (1/2)^2 +(1/2)^3 +….+ (1/2)^36`

    `=>2A=1+1/2+1/(2^2)+….+1/(2^35)`

    `2A-A=A=1-1/(2^36)`

    Học tốt .-.

  2. kiet
    0
    2020-12-01T08:53:06+00:00
    Reply

    Đặt `A=1/2 + (1/2)^2 +(1/2)^3 +….+ (1/2)^36`

    `2A     =1+1/2+(1/2)^2+…+(1/2)^35`

    `2A-A =1-(1/2)^35`

    Hay `1/2 + (1/2)^2 +(1/2)^3 +….+ (1/2)^36=1-(1/2)^35`

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )