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

Toán Lớp 6: Tìm số nguyên x sao cho 3x+4 chia hết x+3

Toán Lớp 6: Tìm số nguyên x sao cho 3x+4 chia hết x+3

Comments ( 2 )

  1. $\\$
    3x+4 \vdots x+3
    ->3x + 9 – 5 \vdots x+3
    -> 3 (x+3)-5 \vdots x+3
    Vì x+3 \vdots x+3 ->3 (x+3) \vdots x+3
    -> 5 \vdots x+3
    ->x+3 ∈ Ư (5)={1;-1;5;-5}
    $\bullet$ x+3=1 ->x=-2 (Thỏa mãn)
    $\bullet$ x+3=-1 ->x=-4 (Thỏa mãn)
    $\bullet$ x+3=5 ->x=2 (Thỏa mãn)
    $\bullet$ x+3=-5 ->x=-8(Thỏa mãn)
    Vậy x ∈ {-2; -4; 2; -8} để 3x+4 \vdots x+3
     

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

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