再一题：GWD 27 math Q32

audiencer

大家再帮我看看这一题吧。答案是C，我选A，因为2^3*5^4=5000, y是偶次幂，保证它是正的，还用管x吗？

Q32:

If x³y⁴ = 5,000, is y = 5?

(1)     y is a positive integer.

(2)     x is an integer.

                  

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.

oliviading

這不是本月JJ題!?我舉例一下好了

y=1，x³=5000；

y=2，x³=5000；

y=...................................很多很多!!!

要確定x是整數才ok喔!!!不懂再討論吧

audiencer

多谢多谢

发现自己的思维还很是僵化呵。。。