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

Toán Lớp 6: Tìm x biết: (5x+5) chia hết (x-2)

Toán Lớp 6: Tìm x biết: (5x+5) chia hết (x-2)

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    (5x+5) \vdots (x-2)
    =>(5x-10) \vdots (x-2)
    =>(5x+5)-(5x-10) \vdots (x-2)
    =>15 \vdots (x-2)
    =>(x-2) in Ư(15)={+-1;+-3;+-5;+-15}
    =>x in {1;3;-1;5;-3;7;-13;17}
    Vậy x in {1;3;-1;5;-3;7;-13;17}

  2. 5x+5 vdots x-2
    => x-2+4x+7 vdots x-2
    => 4x+7 vdots x-2
    => x-2+3x+9 vdots x-2
    => 3x+9 vdots x-2
    => x-2+2x+11 vdots x-2
    => 2x+11 vdots x-2
    => x-2+x+13 vdots x-2
    => x+13 vdots x-2
    => x-2+15 vdots x-2
    => 15 vdots x-2
    => (x-2)∈Ư(15)={-15; -5; -3; -1; 1; 3; 5; 15}
    => x∈{-13; -3; -1; 1; 3; 5; 7; 17}

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

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