[問題]GWD2-3

由 **niniya** » 2006-05-11 17:34

What is the remainder when the positive integer n is divided by 2?
(1)When n is divided by 5, the remainder is an odd integer.
(2)When n is divided by 10, the remainder is an odd integer.

請問為什麼條件(1)不行呢??
請大家幫我解答一下吧??謝謝!!

由 **scujean** » 2006-05-11 21:09

niniya \$m[1]:What is the remainder when the positive integer n is divided by 2?
(1)When n is divided by 5, the remainder is an odd integer.
(2)When n is divided by 10, the remainder is an odd integer.

請問為什麼條件(1)不行呢??
請大家幫我解答一下吧??謝謝!!

由1，n=5K+{1,3,5,7,9}
k=1,n=5+1,5+3,5+5,5+7,5+9
上面的值除以2皆于0
k=2, n=10+1,10+3...
上面的值除以2于1
目前為止就有2種可能，不充分

由 **niniya** » 2006-05-12 11:37

謝謝你!!我懂啦!!
可是我想請問一下為什麼被5除...餘數會有5.7.9??

由 **scujean** » 2006-05-12 15:29

niniya \$m[1]:謝謝你!!我懂啦!!
可是我想請問一下為什麼被5除...餘數會有5.7.9??

我耍白痴了

，只會于1,3

[問題]GWD2-3

[問題]GWD2-3

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