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

Toán Lớp 6: Chứng tỏ rằng (10 mũ 28+8 chia hết cho 9)

Toán Lớp 6: Chứng tỏ rằng (10 mũ 28+8 chia hết cho 9)

Comments ( 2 )

  1. Ta có 10^28 +8

    => 1000…0+8 chia hết cho 9

    => 10^28+8 chi hết cho 9

  2. 10^28 + 8

    = 10 * 10 *…* 10 + 8

    = 100…0 + 8

    = 100…8

    Mà 100…8 có 1 + 0 + 0 +…+ 8 = 9 vdots 9

    => 10^28 + 8 vdots 9

     

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

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