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

Toán Lớp 6: X Bài toán 7: Tìm x biết: a) 126 – (x + 32) = 80 c) (x – 5) / 3 + 3 = 24 e) 23 + x / 2 = 37 b) (127 – x) – 15 = 72 d) (x – 4) / 3 – 2 =

Toán Lớp 6: X Bài toán 7: Tìm x biết: a) 126 – (x + 32) = 80 c) (x – 5) / 3 + 3 = 24 e) 23 + x / 2 = 37 b) (127 – x) – 15 = 72 d) (x – 4) / 3 – 2 = 100 f) (x – 52) – 62 = 32

Comments ( 2 )

  1. a) 126 – ( x + 32)  = 80
    ( x + 32) = 126 – 80
    x + 32 =  46
    x = 46 – 32
    x =  14
    Vậy x = 14
    c) ((x-5))/3 + 3 = 24
    ((x-5))/3 = 24 – 3
    ((x – 5))/3 = 21
    (x – 5) : 3 = 21
    ( x – 5) = 21 . 3
    x – 5 = 63
    x = 63 + 5
    x = 68
    e) 23 + x/2 = 37
    x/2 = 37 – 23
    x/2 =  14
    x = 14 . 2
    x = 28
    b) ( 127 – x) – 15 = 72
    ( 127 – x) = 72 + 15
    127 – x =  87
    x = 127 – 87
    x = 40
    d) (x-4)/3 – 2 = 100
    (x-4)/3 = 100 + 2
    (x – 4)/3 = 102
    (x – 4) : 3  = 102
    ( x – 4) = 102 . 3
    x – 4 =  306
    x = 306 + 4
    x = 310
    f) ( x – 52) – 62 = 32
    ( x – 52) = 32 + 62
    x – 52 = 94
    x = 94 + 52
    x = 146

  2. Giải:
    a) 126 – (x + 32) = 80
                  x  + 32  = 126 – 80
                  x  + 32  = 46
                  x            = 46 – 32
                  x            = 14
          Vậy x = 14
    b) (127 – x) – 15 = 72
         127 – x          = 72 + 15
         127 – x          = 87
                  x           = 127 – 87
                  x           = 40
    Vậy x = 40
    c) {(x – 5)}/3 + 3 = 24
        {(x – 5)}/3        = 24 – 3
        {(x – 5)}/3        = 21
         (x – 5)            = 21 . 3
          x – 5             = 63
          x                   = 63 + 5
          x                    = 68
    Vậy x = 68
    d) {x – 4}/3 – 2 = 100
        {x – 4}/3       = 100 + 2
        {x – 4}/3       = 102
         x – 4            = 102 . 3
        x  – 4            = 306
       x                    = 306 + 4
       x                    = 310
    Vậy x = 310
    e) 23 + x/2 = 37
                x/2  = 37 – 23
               x/2   = 14
               x      = 14 . 2
               x      = 28
    Vậy x = 28
    f) (x – 52) – 62 = 32
        x – 52          = 32 + 62
        x – 52          = 94
        x                  = 94 + 52
        x                  = 146
    Vậy x = 146
     

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

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