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

Toán Lớp 6: các bạn cho mình hỏi b)2x -138=2^3 . 3^2 c)231-(x – 6 ) = 1339:13

Toán Lớp 6: các bạn cho mình hỏi
b)2x -138=2^3 . 3^2
c)231-(x – 6 ) = 1339:13

Comments ( 2 )

  1. a )
    2 x – 138 = 2^{3} . 3^{2}
    2 x – 138 = 8 . 9
    2 x – 138 = 72
    2 x              = 72 + 138
    2 x              = 210
    x                   = 210 : 2
    x                    = 105
    Vậy x = 105 
    b ) 231 – ( x – 6 ) = 1339 : 13
    231 – ( x – 6 ) = 103
    x – 6                       = 231 – 103
    x – 6                       = 128
    x                                = 128 + 6 
    x                                = 134
    Vậy x = 134
     

  2. b) 2x – 138 = 2^3 . 3^2
    2x – 138 = 8 . 9
    2x – 138 = 72
    2x = 72 + 138
    2x = 210
    x = 210 : 2
    x = 105
    c) 231 – (x – 6) = 1339 : 13
      231 – x + 6 = 103
      237 – x = 103
       x = 237 – 103
       x = 134

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

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