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

Toán Lớp 6: Tìm số nguyên x biết : 3x+2 chia hết cho 2x-1

Toán Lớp 6: Tìm số nguyên x biết : 3x+2 chia hết cho 2x-1

Comments ( 1 )

  1. Ta có : 3x + 2 vdots 2x – 1
               2x – 1 vdots 2x – 1
    ⇒ 2 . ( 3x + 2 ) vdots 2x – 1
         3 . ( 2x – 1 ) vdots 2x – 1
    ⇒ 6x + 4 vdots 2x – 1
         6x – 3 vdots 2x – 1
    ⇒ ( 6x + 4 ) – ( 6x – 3 ) vdots 2x – 1
    ⇒ 7 vdots 2x – 1
    ⇒ 2x – 1 ∈ Ư( 7 ) = { 1 ; 7 ; – 1 ; – 7 }
    ⇒ x ∈ { 1 ; 4 ; 0 ; – 3 }
    Vậy , x ∈ { 1 ; 4 ; 0 ; – 3 }

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