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

Toán Lớp 6: b) 3^x.2 + 15 = 33 c) (x + 7) – 11 = 20 – 18

Toán Lớp 6: b) 3^x.2 + 15 = 33
c) (x + 7) – 11 = 20 – 18

Comments ( 2 )

  1. b)
    3^x. 2 + 15 = 33
    => 3^x. 2 = 33 – 15
    => 3^x. 2 = 18
    => 3^x = 18 : 2
    => 3^x = 9
    => 3^x = 3^2
    => x = 2
      $\text{ Vậy x = 2 }$
    c)
    ( x + 7 ) – 11 = 20 – 18
    => x + 7 – 11 = 2
    => x – 4 = 2
    => x = 2 + 4
    => x = 6
      $\text{ Vậy x = 6 }$
     

  2. b) 3^{x} . 2 + 15 = 33
    => 3^{x} . 2 = 33 -15
    => 3^{x} . 2 = 18
    => 3^{x} = 18 : 2
    => 3^{x} = 9
    => 3^{x} = 3^{2}
    => x =2
    c) (x+7) – 11 = 20 – 18
    => (x+7) – 11 = 2
    => x + 7 = 2 + 11
    => x + 7 = 13
    => x = 13 – 7
    => x = 6

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

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