c******0
发帖数: 172 | 1 Sally likes 225 but not 224; she likes 900 but not 800; she likes 144 but
not 145. Which does she like:
1600 or 1700 | c*****g
发帖数: 1137 | 2 1600
square
【在 c******0 的大作中提到】
: Sally likes 225 but not 224; she likes 900 but not 800; she likes 144 but
: not 145. Which does she like:
: 1600 or 1700
| c******0
发帖数: 172 | 3 我也认为这样，瞧瞧one 美国人怎么看的：
it appears that Sally prefers numbers expressable as the product of perfect
squares: 225 = 3^2 * 5^2, 900 = 3^2 * 10^2, and 144 = 3^2 * 4^2. Unless she
is fickle, she probably would prefer 1600 = 4^2 * 10^2 over the alternative,
1700 = 17 * 10^2. (The trick in this question is that your mathematics
training may have had you reduce the numbers to prime factors a first sight,
which would then require noticing that all the exponents are even in the
liked cases.)
Since 10 and 4 | n*****s
发帖数: 10232 | 4 这人应该是想的太多了
perfect
she
alternative,
sight,
such
【在 c******0 的大作中提到】
: 我也认为这样，瞧瞧one 美国人怎么看的：
: it appears that Sally prefers numbers expressable as the product of perfect
: squares: 225 = 3^2 * 5^2, 900 = 3^2 * 10^2, and 144 = 3^2 * 4^2. Unless she
: is fickle, she probably would prefer 1600 = 4^2 * 10^2 over the alternative,
: 1700 = 17 * 10^2. (The trick in this question is that your mathematics
: training may have had you reduce the numbers to prime factors a first sight,
: which would then require noticing that all the exponents are even in the
: liked cases.)
: Since 10 and 4
| h*****0
发帖数: 4889 | 5 人家说得还是有一定道理的。这道题倒是没什么歧义，其它数字题有不
少有歧义的。
perfect
she
alternative,
sight,
such
【在 c******0 的大作中提到】
: 我也认为这样，瞧瞧one 美国人怎么看的：
: it appears that Sally prefers numbers expressable as the product of perfect
: squares: 225 = 3^2 * 5^2, 900 = 3^2 * 10^2, and 144 = 3^2 * 4^2. Unless she
: is fickle, she probably would prefer 1600 = 4^2 * 10^2 over the alternative,
: 1700 = 17 * 10^2. (The trick in this question is that your mathematics
: training may have had you reduce the numbers to prime factors a first sight,
: which would then require noticing that all the exponents are even in the
: liked cases.)
: Since 10 and 4
| f*****e
发帖数: 148 | 6 数字题目就是找规律
规律有很多,有限范围里,认可了再弄一个最简单的就是了,简单是硬道理么 |
|
