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

Toán Lớp 6: (X+20)chia hết (X+2) Giải giúp em

Toán Lớp 6: (X+20)chia hết (X+2)
Giải giúp em

Comments ( 2 )

  1. $ x+20  ⋮ x+2 ⇒x+2+18  ⋮ x+2 ⇒  18 ⋮ x+2 ⇒ x+2={±1;±2;±3;±6;±9;±18 $
    $ TH1 : x ∈ Z ⇒ x = { -3;-1;-4;0;-5;1;-8;4;-11;7;-20;16 } $
    $ TH2 : x ∈ N ⇒ x ={ 0;1;4;7;16 } $
     

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