Re: [計量] 五題數學請教
※ 引述《think12381 ()》之銘言：
: 這是CAT上test 1中幾題我想不出來和不確定解法的題目
: 想請教一下各位
: 2 At a congress, 50% of the congressmen are from part A,
: 40% ............................... B
: 10% ................................ remander
: if 80% of all the congressmen vote no on a certain issue, what will
: the least percent of the congressmen from part B vote no
: ANS : 50% 這是我的算法 (50%+40%)*80% *4/9 = 30% 請問哪邊錯??
我看不懂你的解法
可設從A來跟remander來的議員都投no
而A來跟remander來的議員佔60%
所以(80-60)/40 % = 50 %
: 12 the number of ways that a btacelet may be strung up with seven different
: color breads
: 我算7!可是錯
鍊子可以旋轉和翻轉
Ans: 7!/7/2 = 6*5*4*3 = 360
: 16 Pat goes to the toy store to buy 2 distinct balls, either a football,
: basketball or soccer ball and 3 different board games if the toy store
: is stocked with all types of balls but only 6 different types of board
: games. how many different selections of 5 items can Pat make?
: 拍謝~我不會解
C(3,2) * C(6,3) = 3 * 20 = 60
: 20 If a cube has an edge of length 10, then the length of the segment
: connecting the center of a face of the cube to any vertex not contained
: in the plane of that face is
: 看不是很懂在問什麼
求一面的中心連到一頂點的距離 而這個頂點不能在那平面上
: 28 After the first term,each term in a sequence is 3 greater than 1/3 of
: preceding term. if t is the first term of the sequence and t!=0, what
: is the ratio of the second term to the first term?
: 拍謝~我不會解
序列:
t, t/3+3....
so
(t/3+3)/t = 1/3 + 3/t
: 請問誰有CAT的詳解一直上版問也不是辦法
: 或著誰可以和我一起討論問題
: 有意者站內回非常謝謝各位
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