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

Toán Lớp 6: Bài 5 : Tìm a ∈ Z để : 5a + 2 ⋮ 3a – 4

Toán Lớp 6: Bài 5 : Tìm a ∈ Z để :
5a + 2 ⋮ 3a – 4

Comments ( 1 )

  1. Tido
    5a+2\vdots 3a-4
    =>3(5a+2)\vdots 3a-4
    =>15a+6\vdots 3a-4
    =>15a-20+26\vdots 3a-4
    Vì 15a-20\vdots3a-4
    =>26\vdots 3a-4
    =>3a-4∈Ư(26)={1;2;13;26;-1;-2;-13;-26}
    =>3a∈{5;6;17;30;3;2;-9;-22}
    Vì 3a\vdots3
    =>3a∈{6;30;3;-9}
    =>a∈{2;10;1;-3}
    Vậy a∈{2;10;1;-3}
     

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