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

Toán Lớp 6: -2/5.(5/17-9/15)-2/5.(2/17+-2/5)

Tháng Mười Hai 17, 2022 Toán học 2 Comments 0 views

Toán Lớp 6: -2/5.(5/17-9/15)-2/5.(2/17+-2/5)

Comments ( 2 )

  1. thudan
    thudan
    17 Tháng Mười Hai, 2022 at 9:39 sáng
    Reply
    -2/5 . ( 5/17 – 9/15)- 2/5 . ( 2/17 + (-2)/5)
    = -2/5 . 5/17 + 2/5 . 3/5 – 2/5 . 2/17+ 2/5 . 2/5
    = -2/5 . ( 5/17 + 2/17) + 2/5 . ( 9/15 + 2/5)
    = -2/5 . 7/17 + 2/5 . 1
    = -14/85 + 2/5
    = 4/17

  2. tonhitruc
    tonhitruc
    17 Tháng Mười Hai, 2022 at 9:39 sáng
    Reply
    -2/5.(5/17-9/15)-2/5.[2/17+(-2/5)]
    =-2/5.(5/17-3/5)-2/5.[2/17+(-2/5)]
    =-2/5.(-26/85)-2/5.[2/17+(-24/85)]
    =-2/5.[(-26/85)+(-24/85)]
    =-2/5.(-10/17)
    =4/17

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

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