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

Toán Lớp 6: 5 mũ x – 1 : 5 = 5 mũ 3, tìm số tự nhiên x

Toán Lớp 6: 5 mũ x – 1 : 5 = 5 mũ 3, tìm số tự nhiên x

Comments ( 2 )

  1. \text {@Luffy Cat}
    $5^{x-1}$ : 5 = $5^{3}$
        $5^{x-1}$  =$5^{3}$ . 5
        $5^{x-1}$  =$5^{4}$
    ⇒ x – 1 = 4
              x = 1 + 4
              x = 5 ( Thỏa mãn)
    Vậy x = 5
     

  2. 5^(x-1):5=5^3
    <=>5^(x-1).5^(-1)=3
    <=>5^(x-2)=5^3
    <=>x-2=3
    <=>x=5
    Vậy x=5
     

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

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