扫描二维码，直接登录
题库 / GMATLA-DS-66
What is the value of ~$\frac{3^{-(x + y)}}{3^{-(x - y)}}$~ ?
(1) ~$x=2$~
(2) ~$y=3$~
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
还没有题目讲解（毕出老师会陆续发布对官方考题的解读，请保持关注）。
涉及根号的运算------先把方程式简化
然后发现简化后的方程只有（-2y）次方
所以y=3🆗
登录 或 注册 后可以参加讨论