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

Toán Lớp 6: 5 mũ x-1 = 31+2 . (-3) Mng giúp mình vớiiiii

Toán Lớp 6: 5 mũ x-1 = 31+2 . (-3)
Mng giúp mình vớiiiii

Comments ( 2 )

  1. Answer
    5^{x – 1} = 31 + 2 . (-3)
    => 5^{x – 1} = 31 – 6
    => 5^{x – 1} = 25
    => 5^{x – 1} = 5^2
    => x – 1 = 2
    => x = 2 + 1
    => x = 3
    $\text{Vậy}$ x = 3

  2. 5^{x – 1} = 31 + 2 · (-3)
    5^{x – 1} = 31 + (-6)
    5^{x – 1} = 25
    5^{x – 1} = 5^2
    x – 1 = 2
    x = 3
    Vậy x = 3

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