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

Toán Lớp 6: GIÚP MÌNH VỚI: 24 Chia hết (2x – 1)

Toán Lớp 6: GIÚP MÌNH VỚI:
24 Chia hết (2x – 1)

Comments ( 2 )

  1. 24 : 2x+1
    ⇒2x+1∈ Ư(24)={-24;-12;-8;-6;-4;-3;-2;-1;1;2;3;4;6;8;24}
    ⇒2x ∈ {-25;-13;-9;-7;-5;-4;-3;-2;0;1;2;3;5;7;23}
    ⇒x ∈ {-2;0;1}

  2. 24 vdots 2x – 1
    => 2x – 1 in Ư(24)
    => 2x – 1 in { 24; 12; 8; 6; 4; 3; 2; 1 }
    Mà 2x – 1 là số lẻ
    => 2x – 1 in { 3; 1 }
    => 2x in { 4; 2 } => x in { 2; 1 }
     

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