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标题: 求PREP-DS-2-80解 [打印本页]

作者: ferferzor 时间: 2009-8-26 21:06 标题: 求PREP-DS-2-80解

80.

If x and y are positive integers such that x = 8y + 12, what is the greatest common divisor of x and y ?

(1) x = 12u, where u is an integer.

(2) y = 12z, where z is an integer.

搞不清楚怎么算，答案是B

请高手指点，谢谢

作者: cheryong 时间: 2009-8-27 06:46

（1）和（2）分别代入计算~

顺便问下~

Prep 数学破解哪里有下啊？~~

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