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

Toán Lớp 6: 1 x – [42 + (-28)] = -8 2 (7 – x) – (25 + 7 ) = – 25 3 (3x – 2 ngũ 4 ) . 7 ngũ 3 = 2 . 7 ngũ 4

Toán Lớp 6: 1 x – [42 + (-28)] = -8
2 (7 – x) – (25 + 7 ) = – 25
3 (3x – 2 ngũ 4 ) . 7 ngũ 3 = 2 . 7 ngũ 4

Comments ( 1 )

  1. x – [42 + (-28)] = -8
    x –  14               = -8
    x                        = -8 + 14
    x                        = 6
    vậy  x = 6
    (7 – x) – (25 + 7 ) = – 25
     (7 – x) – 32       = -25
    7 – x                  = -25 + 32
    7 – x                  = 7
         x                   = 7 – 7
        x                    = 0
    vậy x = 0
    (3x – 2^4 ) . 7^3 = 2 . 7^4
    (3x – 16 ) . 7^3    = 2 . 7^4
    3x – 16                 = 2 . 7^4 : 7^3
    3x – 16                 = 2 . 7
    3x – 16                 = 14
    3x                         = 14 + 16
    3x                         = 30
     x                          = 30 : 3
     x                          = 10
    vậy x = 10

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

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