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

Toán Lớp 6: 5 lũy thừa x-1=25 Có ai trả lời đc ko

Toán Lớp 6: 5 lũy thừa x-1=25
Có ai trả lời đc ko

Comments ( 2 )

  1. 5^(x-1) =25
    => 5^(x-1) = 5^2
    => x-1=2
    => x= 2+1
    => x = 3
    Vậy x= 3
     

  2. Ta có: $5^{x-1}$ = 25
        ⇔ $5^{x-1}$ = $5^{2}$
        ⇔ x – 1 = 2
        ⇔ x = 3 
        Vậy x = 3
    nguyenduyhungk6
     

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