[問題]GWD 27-32~~

[mikelsa]

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.

這題答案是給c
小弟是選A..
想請問大大為何答案是C勒??請幫小弟解惑一下~~感恩

[bosshsu]

C。我的想法如下

5000=2^3x5^4的前提, y=5取決於x和y是否同為(正)整數

1）x未知的情況下(可以是非整數); y可以是5也可以是其他正整數
2）x可以是3也可以是其他整數; y未知的情況下, 可以是其他非整數

供參考
歡迎討論