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

Toán Lớp 6: a,-11 chia hết cho 3-x b, (x-7) chia hết cho (x+6) c, (2x-5) chia hết cho (x-3)

Toán Lớp 6: a,-11 chia hết cho 3-x
b, (x-7) chia hết cho (x+6)
c, (2x-5) chia hết cho (x-3)

Comments ( 2 )

  1. a ) -11 \vdots (3 – x)
    => (3 -x) ∈ Ư(-11) = {-11 ; -1 ; 1 ; 11}
    => x ∈ {14 ; 4 ; 2 ; -8}
    Vậy x ∈ {14 ; 4 ; 2 ;-8}
    b ) (x – 7) \vdots ( x + 6 )
    => ( x + 6 ) – 13 \vdots ( x + 6 )
    => 13 \vdots ( x + 6 )                           Vì x + 6 \vdots x + 6
    => ( x + 6) ∈ Ư(13) = {-13 ; -1 ; 1 ; 13}
    => x ∈ {-19 ; -7 ; -5 ; 7}
    Vậy x ∈ {-19 ; -7 ; -5 ; 7}
    c ) (2x – 5) \vdots ( x – 3 )
    = (2x – 6) + 1 \vdots (x – 3)
    => 1 \vdots ( x – 3 )                                   Vì 2x – 6 \vdots x – 3
    => ( x -3) ∈ Ư(1) = {-1 ; 1}
    => x ∈ {2 ; 4}
    Vậy x ∈ {2 ; 4}
    #dtkc

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

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