Re: [計量] Given two concentric circles, ...
※ 引述《sunrise5566 (想法很邪惡 行為很糟糕)》之銘言：
: Given two concentric circles, such that
: a tangent to the smaller circle cuts the
: larger one at two points 'R' and 'S'.
: If the radius of smaller circle is 2 and
: larger circle is 5, then what is the length of segment 'RS'?
: ANS:2 sqrt(5)
（請自行畫圖）
連接圓心和S, R和切線形成一個等腰三角形
兩邊是5, 底邊上的高是小圓的半徑2
畢氏定理: 2*sqrt[(5^2 - 2^2)] = 2 sqrt(21)
: If the remainder when 10^32 is divided by 11 is 'R', then
: Col A: R+2
: Col B: 3
: ANS:B (我算是c = =)
(11-1)^32 = 11n +1 , n是正整數
我也算相等
: If R = Set of prime numbers from 1 to 50,
: S = Set of multiples of 15 from 10 to 50,
: T = Set of odd numbers from 1 to 50, then
: how numbers will be common in all the three sets?
: ANS: 0
S set沒有質數，R都是質數
答案0
: Given numbers 1, 2, 3, 4 & 5.
: What is the probabilty of choosing two odd numbers
: at random from the given numbers such that
: the sum of the two numbers must be an even number?
5選2有 10種
兩奇數個加起來是偶數有
1, 3
1, 5
3, 5
所以3/10 = 30%
: ANS: (100% 或 30% ) 好像是30 韓文太醜 看不懂
: 以上4題 拜託各位了 <(_ _)>
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※ 編輯: IamSierra 來自: 122.116.209.26 (02/17 18:53)
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※ 編輯: IamSierra 來自: 122.116.209.26 (02/17 19:25)
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