鸡精267看不懂啊，ggjj们给我讲一下啊。

czghy

267.If n is an integer between 10 and 99 and n is divisible by 7, the remainder is 3, is n< 80?
1) When n is divided by 5, the remainder is 0
2) When n is divisible by 3, the reminder is 0
Inclusive ?

n = 7m + 3

from 1) à n = 5k à n = 35t + 10, t = 0, 1, 2, 3, … sonot A

from 2) à n = 3s à n = 21a + 24a = 0, 1, 2, 3, …sonot B

union à n = 35t + 10 , n = 3s à n = 105 k + 45 在 10 到 99 只有45满足条件 so C

这个解题思路是什么？ 10，24,45是怎么的来的

czghy

无助啊~~~

lvbin19900809

不用去想，哪用这么复杂
他说的是n=5k n=7m+3  10是最小的5的倍数除以7余3的  即 （5t+1）*7+3 =5*（7t+2）符合条件，同理下面也是

czghy

thaxxxxxx~~~~~~