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

Toán Lớp 5: Tìm y biết: 5/12 x (8+y) – 1/5 x (15/4 + y) = 15

Home/ Toán Lớp 5: Tìm y biết: 5/12 x (8+y) – 1/5 x (15/4 + y) = 15

Toán Lớp 5: Tìm y biết: 5/12 x (8+y) – 1/5 x (15/4 + y) = 15

Tháng Một 26, 2023 Toán học 2 Comments 0 views

Toán Lớp 5: Tìm y biết:
5/12 x (8+y) – 1/5 x (15/4 + y) = 15

Comments ( 2 )

  1. minhtuquynh
    minhtuquynh
    26 Tháng Một, 2023 at 3:22 sáng
    Reply
    5/12 xx ( 8+y) – 1/5 xx (15/4 + y )= 15
    5/12 xx 8 + 5/12 xx y – 1/5 xx 15/4 – 1/5 xx y = 15
    10/3 + 5/12 xx y – 3/4 – 1/5 xx y = 15
    (5/12 xx y – 1/5 xx y) + ( 10/3 – 3/4) = 15
    y xx ( 5/12 – 1/5) + 31/12 = 15
    y xx 13/60 = 15 – 31/12
    y xx 13/60= 149/12
    y = 149/12 : 13/60
    y= 149/12 xx  60/13
    y= 745/13
    Vậy y= 745/13
     

  2. tuminh25
    tuminh25
    26 Tháng Một, 2023 at 3:21 sáng
    Reply
    5/12 × (8 + y) – 1/5 × (15/4 + y) = 15
    = 5/12 × 8 + 5/12y – 1/5 (15/4 + y) = 15
    = ${ \dfrac{5 × 8}{12}}$ + 5/12y – 1/5 (15/4 + y) = 15
    = 40/12 + 5/12y – 1/5 (15/4 + y) = 15
    = 10/3 + 5/12y – 1/5 (15/4 + y) = 15
    = 10/3 + 5/12y – 1/5 × (15/4) – 1/5y = 15
    = 10/3 + 5/12y + ${ \dfrac{- 15}{5 × 4}}$ – 1/5y = 15
    = 10/3 + 5/12y + ${ \dfrac{-15}{20}}$ – 1/5y = 15
    = 10/3 + 5/12y – 3/4 – 1/5y = 15
    = 40/12 + 5/12y – 9/12 – 1/5y = 15
    = ${ \dfrac{40 – 9}{12}}$ + 5/12y – 1/5y = 15
    = 31/12 + 5/12y – 1/5y = 15
    = 31/12 + 13/60y = 15
    = 13/60y = 15 – 31/12
    = 13/60y = 180/12 – 31/12
    = 13/60y = ${ \dfrac{180 – 31}{12}}$
    = 13/60y = 149/12
    y = 149/12 × (60/13)
    y = ${ \dfrac{149 × 60}{12 × 13}}$
    y = 8940/156
    y = 745/13
    Cho mình xin hay nhất nha bạn!!!!!
    @Drew Mclntyre

    toan-lop-5-tim-y-biet-5-12-8-y-1-5-15-4-y-15

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

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