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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: `S =1/{1.2}+1/{2.3}+1/{3.4}+…+1/{2020. “

Home/ Toán Lớp 6: `S =1/{1.2}+1/{2.3}+1/{3.4}+…+1/{2020. “

Toán Lớp 6: `S =1/{1.2}+1/{2.3}+1/{3.4}+…+1/{2020. “

Tháng Bảy 15, 2022 Toán học 2 Comments 0 views

Toán Lớp 6: S =1/{1.2}+1/{2.3}+1/{3.4}+…+1/{2020. ”

Comments ( 2 )

  1. mytamhoang
    mytamhoang
    15 Tháng Bảy, 2022 at 4:19 chiều
    Reply
    S = $\frac{1}{1}$ -$\frac{1}{2}$ + $\frac{1}{2}$ – $\frac{1}{3}$ + …. + $\frac{1}{2020}$ – $\frac{1}{2021}$
    = 1 – $\frac{1}{2021}$
    = $\frac{2020}{2021}$
     

  2. khanhngantoan
    khanhngantoan
    15 Tháng Bảy, 2022 at 4:19 chiều
    Reply
    $\dfrac{1}{1.2}+\dfrac{1}{2.3}+\dfrac{1}{3.4}+…+\dfrac{1}{2020.2021}$
    $=\dfrac{1}{1}-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{4}+…+\dfrac{1}{2020}-\dfrac{1}{2021}$
    $=\dfrac{1}{1}-\dfrac{1}{2021}$
    $=\dfrac{2021-1}{2021}$
    $=\dfrac{2020}{2021}$
    Chúc bạn học tốt !!!

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222-9+11+12:2*14+14 = ? ( )

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