Toán Lớp 7: chứng tỏ rằng 8⁷ + 2¹⁷ chia hết cho 17.
Leave a reply
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.
Toán Lớp 7: chứng tỏ rằng 8⁷ + 2¹⁷ chia hết cho 17.
Comments ( 1 )
$\text{ Ta có : }$
8^7 + 2^{17}
= 2^{21} + 2^{17}
= 2^{17}. ( 2^4 + 1 )
= 2^{17}. ( 16 + 1 )
= 2^{17}. 17 \vdots 17 $\text{ ( đpcm ) }$