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๖ACE✪ ๖ۣۜVôঔ๖ۣۜD๖ۣۜA๖ۣۜN๖ۣۜH ᴾᴿᴼシ
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๖ACE✪ ๖ۣۜVôঔ๖ۣۜD๖ۣۜA๖ۣۜN๖ۣۜH ᴾᴿᴼシ
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2022-08-08 21:32:08
Cho n chia hết cho 3
=> n(n+1) chia hết cho 3
<=> n+1 chia hết cho 3
=> n= 5,8,11,14,.....
=> n chia hết cho 3 thì n(n+1) chia hết cho 6
2022-08-08 21:29:48
Cho n là 1 số bất kỳ
N chẵn thì lập phương lên cũng bằng lẻ
N lẻ lập phương lên cũng bằng lẻ
=> Với mọi số tự nhiên n,nếu n lẻ thì n3 lẻ