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: Cho S= 1+3+3^2+3^3+3^4+3^5+3^6+3^7+3^8+3^9 Chứng tỏ rằng x chia hết cho 4

Tháng Ba 12, 2023 Toán học 0 Comments 0 views

Toán Lớp 6: Cho S= 1+3+3^2+3^3+3^4+3^5+3^6+3^7+3^8+3^9 Chứng tỏ rằng x chia hết cho 4

Comments ( 2 )

  1. thudan
    thudan
    12 Tháng Ba, 2023 at 8:36 sáng
    Reply
    $\text{S = 1 + 3 + $3^2$ + $3^3$ + $3^4$ + $3^5$ + $3^6$ + $3^7$ +$3^8$ + $3^9$ }$
    $\text{S = (1 + 3 ) + ( $3^2$ + $3^3$ ) + ( $3^4$ + $3^5$ ) + ( $3^6$ + $3^7$ ) + ( $3^8$ + $3^9$ )  }$
    $\text{S = 4 + $3^2$ ( 1 + 3 ) + $3^3$ ( 1 + 3) + … + $3^8$ ( 1 + 3 )}$
    $\text{S = 4 + $3^2$ .4 + $3^3$ . 4 + … + $3^8$ . 4 )}$
    $\text{S = 4 ( 1 + $3^2$ + $3^3$ + … + $3^8$ ) $\vdots$ 4 ( vì 4 $\vdots$ 4 )}$
    $\text{ Vậy S $\vdots$ 4}$

  2. aivilanlan
    aivilanlan
    12 Tháng Ba, 2023 at 8:36 sáng
    Reply
    S=4+9+27+81+243+729+2187+6561+19683 =29524 =>29524÷4=7381 Vậy S chia hết cho 4
    vote + trả lời hay nhất ạ

Leave a reply

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

Hồng

About Hồng