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2022-05-29 20:26:13
2022-05-10 20:39:16
2022-05-10 20:34:50
2n+33n−1∈Z2n+33n−1∈Z
<=> 2n + 3 chia hết cho 3n - 1
<=> 6n + 9 chia hết cho 3n - 1
<=> (6n - 2) + 11 chia hết cho 3n - 1
<=> 2(3n - 1) + 11 chia hết cho 3n - 1
<=> 11 chia hết cho 3n - 1
<=> 3n - 1 thuộc Ư(11) = {±1;±11±1;±11}
Thay từng giá trị vào 3n - 1 để tìm n
Rồi xét giá trị của n có nguyên hay không
Nếu không thì vứt
Nếu là số nguyên thì nhận
2022-05-10 20:25:30
1/9 nhé
2022-05-09 20:46:52
2022-05-09 20:45:31
2022-05-09 19:38:44
2022-05-09 19:32:33
2022-05-09 19:24:08
2022-05-09 19:23:28