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标题: TTGWD6-27谢谢拉 [打印本页]

作者: jessiebetty 时间: 2006-7-28 18:04
标题: TTGWD6-27谢谢拉

Q27:

The sum of positive integers x and y is 77. What is the value of xy?

(1) x = y + 1

(2) x and y have the same tens digit.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

为什么是D,明明是A拉

作者: lovetiky 时间: 2006-7-28 19:00

x y 只能是 38 和 39 ，或者 39 和 38

但是先后顺序并不影响他们的乘积

作者: christlulu 时间: 2006-11-4 22:47
居然写答案的时候写错了，晕亚。。

[此贴子已经被作者于2006-11-4 22:53:47编辑过]

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