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

Toán Lớp 5: 2 x y +(1/2+1/6+1/12+-..+1/2020×2021=4041/2021

Home/ Toán Lớp 5: 2 x y +(1/2+1/6+1/12+-..+1/2020×2021=4041/2021

Toán Lớp 5: 2 x y +(1/2+1/6+1/12+-..+1/2020×2021=4041/2021

Tháng Một 5, 2023 Toán học 2 Comments 0 views

Toán Lớp 5: 2 x y +(1/2+1/6+1/12+……+1/2020×2021=4041/2021

Comments ( 2 )

  1. annhocbichchaubich
    annhocbichchaubich
    5 Tháng Một, 2023 at 2:42 chiều
    Reply
    2 × y + (1/2 + 1/6 + 1/12 + …………… + 1/(2020 × 2021) = 4041/2021
    2 × y + (1/(1 × 2) + 1/(2 × 3) + ………… + 1/(2020 × 2021)) = 4041/2021
    2 × y + (1 – 1/2 + 1/2 – 1/3 + ………….. + 1/2020 – 1/2021) = 4041/2021
    2 × y + 2020/2021 = 4041/2021
    2 × y = 4041/2021 – 2020/2021 = 2021/2021 = 1
    ⇒ y = 1/2

  2. doanthulan
    doanthulan
    5 Tháng Một, 2023 at 2:41 chiều
    Reply
    Giải đáp + Lời giải và giải thích chi tiết:
    2xxy+(1/2+1/6+1/12+…+1/(2020xx2021))=4041/2021
    2xxy+(1/(1xx2)+1/(2xx3)+1/(3xx4)+…+1/(2020xx2021))=4041/2021
    2xxy+(1-1/2+1/2-1/3+1/3-1/4+…+1/2020-1/2021)=4041/2021
    2xxy+(1-1/2021)=4041/2021
    2xxy+(2021/2021-1/2021)=4041/2021
    2xxy+2020/2021=4041/2021
    2xxy=4041/2021-2020/2021
    2xxy=1
    y=1:2
    y=1/2
     

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

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