Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

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

Toán Lớp 6: A=2^2^2n +5 chia hết cho 7 với mọi n>0 chứng minh nh

Toán Lớp 6: A=2^2^2n +5 chia hết cho 7 với mọi n>0 chứng minh nh

Comments ( 1 )

  1. A=2^(2^(2n))+5
    A=2^(4n)+5
    A=2^((3+1)n)+5
    A=2^(B(3+1))+5
    A=2^(3k+1)+5
    A=8^k. 2-2+7
    A=2(8^k+1^k)+7
    =>8^k-1^kvdots8-1=7=>2(8^k-1^k)vdots7
    =>7vdots7
    =>A=2^(2^(2n))vdots7(đpcm) 
    @Ki ng

Leave a reply

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

About Kim Dung