PrepT1-DS-Q167和Q170
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)
我只會用列舉的方式
這樣要花太長的時間
不知道有沒有其他作法呢?
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)
謝謝:)
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※ 編輯: Jinai 來自: 61.229.105.195 (10/31 19:24)
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11/01 14:03, 1F
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