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

Toán Lớp 6: Tìm n A. 6 chia hết n+1 B. 21 chia hết 2n+1

Toán Lớp 6: Tìm n
A. 6 chia hết n+1
B. 21 chia hết 2n+1

Comments ( 1 )

  1. $\text{a)Vì 6 $\vdots$ n + 1}$
    $\text{⇒ n + 1 ∈ Ư(6)}$
    $\text{⇒ n + 1 ∈ {1 ; 2 ; 3 ; 6} }$
    $\text{⇒ n ∈ { 0 ; 1 ; 2 ; 5} }$
    $\text{Vậy n ∈ {0 ; 1 ; 2 ; 5}}$
    $\text{b)Vì 21 $\vdots$ 2n + 1}$
    $\text{⇒ 2n + 1 ∈ Ư(21)}$
    $\text{⇒ 2n + 1 ∈ {1 ; 3 ; 7 ; 21} }$
    $\text{⇒ 2n ∈ {0 ; 2 ; 6 ; 20}}$
    $\text{⇒ n ∈ {0 ; 1 ; 3 ; 10}}$
    $\text{Vậy n ∈ {0 ; 1 ; 3 ; 10}}$
     

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