作者Jinai (橘子汽水好喝~)
看板GMAT
标题[问题] PrepT2-PS-Q167
时间Wed Oct 31 19:10:09 2007
167
If x, y, and z are integers and xy + z is an odd integer, is x an even integer?
(1) xy + xz is an even integer.
(2) y + xz is an odd integer.
ans:(A)
我只会用列举的方式
这样要花太长的时间
不知道有没有其他作法呢?
170
If n and t are positive integers, what is the greatest prime factor of the product nt ?
(1) The greatest common factor of n and t is 5.
(2) The least common multiple of n and t is 105.
ans:(B)
谢谢:)
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※ 编辑: Jinai 来自: 61.229.105.195 (10/31 19:24)
1F：推 infnac:也想问No.167这种题目，要用什麽方法解比较快呢？ 11/01 14:03