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2022-07-28 10:04:31
2022-07-15 08:54:06
2022-07-06 20:40:18
vì 36a3b⋮ 36 => 36a3b ⋮ 9 và 4
để 36a3b ⋮4 nên b = 2 hoặc 6
nếu b = 2 thì 36a32 ⋮ 9
=>17 + a ⋮ 9
=> 9 + 8 + a ⋮ 9
=> 8 + a ⋮ 9 ( vì 9 ⋮ 9)
mà 8 ≤ 8 + a ≤ 17
=> 8 + a = 9
=> a =1
nếu b=6 thì 36a36 ⋮ 9
=> 18 +a ⋮ 9
=>a ⋮ 9 ( vì 18 ⋮ 9 )
mà 0 ≤ a ≤ 9
=> a = 0 hoặc 9
2022-07-06 20:23:46
gọi số cần tìm là n. Ta có :
n : 5 (dư 2) => n + 3 chia hết cho 5
n : 6 (dư 3) => n +3 chia hết cho 6
vì n+3 chia hết cho 5 và 6 => n là BC(5,6)
5 = 5
6 = 2 . 3
BCNN(5,6) là : 2 . 3 . 5