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

Toán Lớp 6: tìm x thuộc z sao cho: 2.x+1 chia hết cho x-1

Toán Lớp 6: tìm x thuộc z sao cho:
2.x+1 chia hết cho x-1

Comments ( 2 )

  1. @chaucute12
    chúc bạn học tốt!

    toan-lop-6-tim-thuoc-z-sao-cho-2-1-chia-het-cho-1

  2. Ta có: 2x+1 $\vdots$ x-1
    ⇒$\left \{ {{2x+1 \vdots x-1} \atop {x-1} \vdots x-1} \right.$ 
    ⇒(2x+1)-(x-1) $\vdots$ x-1
    ⇒2x+1-x+1 $\vdots$ x-1
    ⇒2 $\vdots$ x-1
    ⇒x-1∈Ư(2)
    ⇒x-1∈{-1;-2;1;2}
    ⇒x∈{0;-1;2;3}
    Vậy x∈{0;-1;2;3}

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