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

Toán Lớp 6: tìm x thuộc N sao cho: (2x-1) chia hết (x-1)

Toán Lớp 6: tìm x thuộc N sao cho: (2x-1) chia hết (x-1)

Comments ( 2 )

  1. 2x-1 vdots x-1
    ⇔ 2x-2+1 vdots x-1
    ⇔ 2(x-1)+1 vdots x-1
    Mà 2(x-1) vdots x-1 ⇒ 1 vdots x-1
    ⇒ x-1 ∈ $Ư(1)$
    ⇒ x-1 ∈ {-1 ; 1}
    ⇒ x ∈ {0 ; 2}
    Vậy x = {0 ; 2}

  2. \text{2x – 1 chia hết cho x – 1.}
    \text{Vì x – 1 chia hết cho x – 1 nên 2 . (x – 1) chia hết cho x – 1.}
    \text{Hay 2x – 2 chia hết cho x – 1.}
    \text{Mà 2x – 1 chia hết cho x – 1.}
    \text{→ (2x – 1) – 1 chia hết cho x – 1.}
    \text{→ 1 chia hết cho x – 1.}
    \text{→ x – 1 = 1; -1.}
    \text{→ x = 2; 0.}

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

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