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

Toán Lớp 6: Tĩm biết: (3x+1) chia hết (x+1)

Toán Lớp 6: Tĩm biết:
(3x+1) chia hết (x+1)

Comments ( 2 )

  1. Giải đáp:
    x \in {0 ; -2 ; 1 ; -3}
    Lời giải và giải thích chi tiết:
     3x + 1 \vdots x + 1
    => 3 (x+1) – 2 \vdots x + 1
    => 2\vdots x+1 (do 3 (x+1) \vdots x+1 \forall x \in ZZ)
    => x +1 \in Ư(2) (do x \in ZZ)
    =>x + 1 \in {1;-1;2;-2}
    =>x \in {0 ; -2 ; 1 ; -3}
    Vậy x \in {0 ; -2 ; 1 ; -3}

  2. $\text{3x+1 $\vdots$ x+1}$
    $\Rightarrow$ $\text{3x+3-2 $\vdots$ x+1}$
    $\Rightarrow$ $\text{-2 $\vdots$ x+1}$
    $\Rightarrow$ $\text{x+1 $\in$ Ư(-2)={±1;±2}}$
    $\Rightarrow$ $\text{x+1 $\in$ {±1;±2}}$
    $\Rightarrow$ $\text{x $\in$ {-2;0;1;-3}}$

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