YOMEDIA
NONE

Tính A=5/1.3+5/3.5+5/5.7+...+5/99.101

Tính: A = 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Theo dõi Vi phạm
ADSENSE

Trả lời (1)

  • \(A=\dfrac{5}{1.3}+\dfrac{5}{3.5}+\dfrac{5}{5.7}+...+\dfrac{5}{99.101}\)

    \(A=5.\left(\dfrac{1}{1.3}+\dfrac{1}{3.5}+\dfrac{1}{5.7}+...+\dfrac{1}{99.101}\right)\)

    \(A=5.\dfrac{1}{2}.\left(\dfrac{2}{1.3}+\dfrac{2}{3.5}+\dfrac{2}{5.7}+...+\dfrac{2}{99.101}\right)\)

    \(A=\dfrac{5}{2}.\left(1-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{7}+...+\dfrac{1}{99}-\dfrac{1}{101}\right)\)

    \(A=\dfrac{5}{2}.\left(1-\dfrac{1}{101}\right)\)

    \(A=\dfrac{5}{2}.\dfrac{100}{101}=\dfrac{5.50}{101}=\dfrac{250}{101}=2\dfrac{48}{101}\)

      bởi Nguyễn Hồng Gấm 15/12/2018
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