[求助]GWD29-36

hedongshi

Q36:

Is x > 5 ?

(1)     x² > 25

(2)     2x + 7 > 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

答案是C,可我觉得B就可以推 出来啊

xiongxiong88

(2)     2x + 7 > 0  ONLY 推 出 x > -7/2  !!!

hedongshi

是啊，要是x〉-7/2，不是一定大于5了吗？？

observer

C

5>x>-3.5or x>5不对

WTO

拜托,大于一个负数不一定就大于一个正数

hedongshi

thanks ,又钻牛角尖了!!