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

Toán Lớp 6: tìm x : -x + 11/30 = 19/30 + x : 2

Toán Lớp 6: tìm x : -x + 11/30 = 19/30 + x : 2

Comments ( 2 )

  1. @Thỏ
    -x + 11/30 = 19/30 + x : 2
    -x + 11/30 = 19/30 + x : 2
    -x – x : 2   = 19/30 – 11/30
    -x + -x . 1/2 = 4/15
    -x . (1 + 1/2) = 4/15
    -x . 3/2            = 4/15
    -x                      = 4/15 : 3/2
    -x                      = 8/45
    ⇒ x = -8/45
    Vậy x = -8/45
     

  2. -x + 11/30 = 19/30 + x : 2
    -x – x : 2     = 19/30 – 11/30
    -x + (-x) . 1/2 = 4/15
    -x . ( 1 + 1/2) = 4/15
    -x . 3/2          = 4/15
    -x                   = 4/15 : 3/2
    -x                    = 8/45
    ⇒ x = -8/45
    Vậy x = -8/45
     

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