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

Toán Lớp 7: A,(2x-5).2³/2²=2⁴+14 B,(3x-6).3²/2²=3⁴

Toán Lớp 7: A,(2x-5).2³/2²=2⁴+14
B,(3x-6).3²/2²=3⁴

Comments ( 2 )

  1. A) (2x – 5) . 2^{3}/2^{2} = 2^{4} + 14
    = (2x – 5) . 2 = 16 + 14 = 30
    => 2x – 5 = 30 : 2 = 15
    => 2x = 15 + 5 = 20
    => x = 20 : 2
    => x  = 10
    Vậy x = 10
    B) (3x – 6) . 3^{2}/2^{2} = 3^{4}
    => 3x – 6 = 3^{4} : 3^{2}/2^{2} = 36
    => 3x = 36 + 6 = 42
    => x = 42 : 3
    Vậy x = 14
     

  2. A. (2x – 5) · 2^3/2^2 = 2^4 + 14
       (2x – 5) · 2 = 16 + 14
       (2x – 5) · 2 = 30
       2x – 5 = 30 : 2
       2x – 5 = 15
       2x = 15 + 5 
       2x = 20
       x = 20 : 2
       x = 10
    Vậy x = 10
    B. (3x – 6) · 3^2/2^2 = 3^4
       (3x – 6) · 9/4 = 81
       3x – 6 = 81 : 9/4
       3x – 6 = 81 · 4/9
       3x – 6 = 36
       3x = 42
       x = 42 : 3
       x = 14
    Vậy x = 14
     

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

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