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

Toán Lớp 6: (3x+15) chia hết cho (x+3). Tìm x

Toán Lớp 6: (3x+15) chia hết cho (x+3). Tìm x

Comments ( 1 )

  1. 3x+15 \vdots x+3
    => 3x + 9+6 \vdots x +3
    => 3(x+3) +6 \vdots x +3
    Vì 3(x+3) \vdots x+3
    => 6 \vdots x +3
    => x+3 \in Ư(6) = {±1 ; ±2; ±3 ; ±6}
    => x \in {-2 ; -4 ; -1 ; -5 ; 0 ; -6 ; 3 ; -9}
    Vậy x \in {-2 ; -4 ; -1 ; -5 ; 0 ; -6 ; 3 ; -9}
     

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

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