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匿名 發問於 教育及參考書小學及中學教育 · 7 年前

F.3 Maths Exam QQ Urgent.....

http://i.imgur.com/hBBNZNa.jpg

clear steps

kindly allow me to ask u if i still cant understand the question.

2 個解答

評分
  • 7 年前
    最愛解答

    2^(n – 1) + 2^n

    --------------------------

    3 . 2^(n + 1)

    2^n . 2^(-1) + 1. (2^n)

    --------------------------------

    3 . (2^n) . (2^1)

    2^n (1/2) + 1. 2^n

    --------------------------

    3 . (2^n) . ( 2)

    2^n [ (1/2) + 1]

    --------------------------

    (2 x 3) . 2^n .

    cancel the term 2^n in both numerator and denominator

    [ (1/2) + 1]

    --------------------

    6

    (1 1/2)/6

    (3/2)/ (6)

    1/4 ~ Answer

    Note:

    You have to know that

    2^(m + n) = (2^m) x (2^n)

    2^n = 1 x (2^n)

    2^(-1) = 1/(2^1) = 1/2

    x = multiplication sign,

    2013-12-17 04:14:39 補充:

    Another way:

    2^(n – 1) = (2^n) / (2^1)

    =2^n / 2

    =( 2^n ) (1/2)

  • 7 年前

    答案在此,有不明白的地方請提出:

    http://yahoknowledgehkanswer.weebly.com/uploads/1/...

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