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

Toán Lớp 6: Cho A = 9^23 + 5.3^43. Chứng minh rằng A chia hết cho32.

Toán Lớp 6: Cho A = 9^23 + 5.3^43. Chứng minh rằng A chia hết cho32.

Comments ( 2 )

  1. $A=9^{23}+5.3^{43}$

    $=(3^2)^{23}+5.3^{43}$

    $=3^{2.23}+5.3^{43}$

    $=3^{46}+5.3^{43}$

    $=3^{43+3}+5.3^{43}$

    $=3^{43}.3^3+5.3^{43}$

    $=3^{43}(3^3+5)$

    ->3^43. 32vdots32 (đpcm)

  2. A = 9^23 + 5.3^43
    A =(3^2)^23+ 5.3^43
    A =3^46+ 5.3^43
    A =3^43.(3^3+5)
    A =3^43.32
    ⇒A chia hết cho 32

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

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