Toán Lớp 7: C/M: 27^8-3^21 chia hết cho 26
Helpppppp me. Mình đag cần gấp. Mình sẽ vote 5 sao.
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Toán Lớp 7: C/M: 27^8-3^21 chia hết cho 26
Helpppppp me. Mình đag cần gấp. Mình sẽ vote 5 sao.
Comments ( 2 )
=27^8-3^(3.7)
=27^8-(3^3)^7
=27^8-27^7
=27^7 . 27-27^7 . 1
=27^7 .(27-1)
=27^7 . 26
Ta có:
26\vdots26
=>27^7 . 26\vdots26
=>27^8-3^21\vdots26(text{ĐPCM})
Vậy 27^8-3^21\vdots26