TT17-9，TT17-15

cooperqi

Q9:

Is x greater than y ?

(1)     x – y² > 0

(2)     xy < 0

                  

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: C

我选的是A，我觉得X〉Y^2了，能说明X〉Y，可能我想的有错误吧！

 

 

Q15:

In the xy-plane, does the point (a, b) lie above the line y = x ?

(1)     a = 2

(2)     b = a + 2

                  

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: B

不知道怎么想……唉

麻烦大家了

bastencools

QUOTE:

Q9:

Is x greater than y ?

(1)     x – y² > 0

(2)     xy < 0

（1）得出x>y2,所以x 是大于零的，（2）得出X和Y是异号，

综合上述，x 大于零，y小于零，所以x大于y，得出C

                  

第二题

（1）单独不充分 （2) 的话你先画个图，然后对照是在y=x 这个图的下方还是上方就可以了。事实上这两个是平行的，只是Y轴上的截距不同