gwd 13-5

Q5:

If x and y are positive, is x³ > y?

(1)    > y

(2)   x > y

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E,我的是C,哪位帮忙解答一下

补全题目:

If x and y are positive, is x³ > y?

(1)   Vx> y

(2)   x > y

用数字带就可以了,x=1/4,y=1/3,得出 x³ < y

再带x=1/4,y=2/64,得出x³ > y