[求助]gwd25-5

Rachmaninoff

Q5

If x^3y^4=5,000, is y=5?

(1)y is a positive integer.

(2)x is an integer.

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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:

答案是C,为什么呢？不就是x=2，y=5，谢谢大家

greatvampirer

x^3y^4=5000=5*10^3

条件一，Y是正整数，有可能是5，也可能是3或其他，因为这里不要求X是整数；结合条件二，就可以得出x=2，y=5，所以答案是C

peiyangzhe

y可以是正负5

longger

y is a positive integer.

意思是Y是正整数

Rachmaninoff

thanks