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题库 / Prep2007E1-DS-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.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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是个好idea 但是xy+z和xy+xz做差结果是xz-z= z(x-1)哦。如此说来我有个疑问， z（x-1）必是奇数，其中一奇一偶， 但当z为奇数时，x-1为偶， 那么x就是奇数了呀？如何解释？
哦哦 我说错啦 z（x-1）必为奇数 所以z 和x-1是奇数 所以x必然是偶数！登录 或 注册 后可以参加讨论