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

Toán Lớp 6: (2x +9) chia hết cho (x – 2) Mong các bạn giúp mik

Toán Lớp 6: (2x +9) chia hết cho (x – 2)
Mong các bạn giúp mik

Comments ( 2 )

  1. Để 2x+9⋮x-2 (x∈N)
    → (2x-4)+13⋮x-2
    →2(x-2)+13⋮x-2
    Vì 2(x-2)⋮x-2
    → 2(x-2)+13⋮x-2
    Khi 13⋮x-2
    →(x-2)∈Ư(13)
    →(x-2)∈{1;13}
    →x∈{2;15}

  2. 2x + 9 \vdots x – 2
    => (2x – 4 ) + 13 \vdots x – 2
    => 13 \vdots x – 2                                        ( Vì 2x – 4 \vdots x – 2 )
    => x – 2 ∈ Ư(13) = {-13 ; -1 ; 1 ; 13}
    => x ∈ {-11 ; 1 ; 3 ; 15}
    Vậy x ∈ {-11 ; 1 ; 3 ; 15}
    #dtkc

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

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