贴一体OG数学，请教~

zcool

36. For all integers n, the function f is defi ned by f(n) = an,
where a is a constant. What is the value of f(1) ?
(1) f(2) = 100
(2) f(3) = –1,000
答案B

对于（1），可以推出a=10/-10，对应的f（1）有两个解，这不算是确定了f（1）的值吗？OG的解释是，有两个解就不算确定，好像和中国的数学的思路不一样啊，有多解的题目，把所有值列出来了就算确定值了。。而老外认为唯一的值才是确定答案的。。是这样吗？

还有一体类似的OG12：

30. What is the value of integer n ?
(1) n ( n + 1) = 6
(2) 22n = 16

答案都是B

zcool

十分感谢，前面在OG12 DS说明找到了，如下：

4. Answer the question asked.
For example, if the question asks, “What is the value of y ?” for an answer statement to be
sufficient, you must be able to find one and only one value for y. Being able to determine
minimum or maximum values for an answer (e.g., y = x + 2) is not sufficient, because such
answers constitute a range of values rather than the specific value of y.

kingapple25

36. For all integers n, the function f is defi ned by f(n) = an,
where a is a constant. What is the value of f(1) ?
(1) f(2) = 100
(2) f(3) = –1,000
答案B

对于（1），可以推出a=10/-10，对应的f（1）有两个解，这不算是确定了f（1）的值吗？OG的解释是，有两个解就不算确定，好像和中国的数学的思路不一样啊，有多解的题目，把所有值列出来了就算确定值了。。而老外认为唯一的值才是确定答案的。。是这样吗？是，唯一解才算确定，这个在OG上有明确说明

还有一体类似的OG12：

30. What is the value of integer n ?
(1) n ( n + 1) = 6
(2) 22n = 16

答案都是B

-- by 会员 zcool (2010/3/30 0:15:02)