GMAT GWD管卫东 第四套 要考试了 拜谢!

题目

GMAT GWD管卫东 第四套 要考试了 拜谢!
Q7:
If x(x - 5)(x + 2) = 0,is x negative?
(1)x05 x2 – 7x ≠ 0
(2)x05 x2 –2x –15 ≠ 0
x05
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.
Answer:
我选了B
Q35:
If n is a positive integer,which of the following is a possible value of |56 - 5n|?
A.x057
B.x059
C.x0512
D.x0515
E.x0520
Answer:
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我选了A
这两题都觉得自己是对的啊,其实都是很简单的题,有人帮我看一眼么?

答案

第一题 由题干可以得 X有三种可能的解 -2,0,5. 问能不能判断X是负的（换句话说能不能确定X=-2）A. 可以得出X不等于0且X不等于7（在A的条件下,X还有可能为5,所以不能判断是负数）B.因式分解之后可以算出X不等于5且不...