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

Toán Lớp 8: Tìm n thuộc Z để 2n^2-n+2 chia hết cho 2n+1

Toán Lớp 8: Tìm n thuộc Z để 2n^2-n+2 chia hết cho 2n+1

Comments ( 1 )

  1. $\\$
    2n^2-n+2\vdots 2n+1
    ->2n^2 + n – 2n – 1 +3\vdots 2n+1
    -> n(2n+1)-(2n+1)+3\vdots 2n+1
    -> (2n+1)(n-1)+3\vdots 2n+1
    ->3\vdots 2n+1
    ->2n+1\in Ư (3)={1;-1;3;-3}
    ->n\in {0; -1; 1; -2}
    Vậy x\in {0; -1; 1; -2} để 2n^2-n+2\vdots 2n+1
     

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

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