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

Toán Lớp 6: Cho A= 2.5.7.9.13 + 78. Hỏi A có chia hết cho 3;6;9;13 ko, vì sao

Toán Lớp 6: Cho A= 2.5.7.9.13 + 78. Hỏi A có chia hết cho 3;6;9;13 ko, vì sao

Comments ( 2 )

  1. A=2.5.7.9.13+78=8190+78=8268
    <=>8268:3=2756
    <=>8268:6=1378
    <=>8268:9=918 ( dư 6 )
    <=>8268:13=636
    =>8268\vdots3, 6, 13
    =>8268\cancel{vdots}9 vì 8268:9 dư 6
     

  2. $\text{Ta có:}$
    A = 2 . 5 . 7 . 9 . 13 + 78
    A = 10 . 7 . 9 . 13 + 78
    A = 70 . 9 . 13 + 78
    A = 630 . 13 + 78
    A = 8190 + 78
    A = 8268
    $\text{Ta có:}$
    8268 \vdots 3
    8268 \vdots 6
    8268 \cancel{vdots} 9
    8269 \vdots 13

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