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 |
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