[讨论]prep里的一道数学题

kirstenrl87 · 发表于 2008-10-12 21:43:00

DS: Is the three digit N less than 550

(1) The product of the digits in N is 30

(2) The sum of the digits in N is 10

答案选E，但我觉得是A，为什么呢，XDJM们来指点一下吧！

sampinglin · 发表于 2008-10-12 22:32:00

because the product the the numbers can be expressed as 6*5*1 or 2*3*5,so E is the right answer, right?

kirstenrl87 · 发表于 2008-10-12 22:35:00

Yes, thank you very much.

cxdao · 发表于 2008-10-12 23:33:00

弱弱地问一下,为什么不能选c呢?

(1)的两种情况2*3*5和1*5*6,可以根据(2)的条件去掉1*5*6,因为2+3+5=10哦,这样(1)和(2)一起就可以解出,是么?

sausau · 发表于 2008-10-15 00:11:00

明明c对嘛。

wawadream · 发表于 2008-12-9 08:46:00

The answer is C!

sniperbill · 发表于 2008-12-9 16:04:00

恩，我也觉得C对

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