64.sqrt{2sqrt + 2/}
Answer: 4
65.two right cylinders, A and B. radius of A is 2 times radius of B. height of A is half the height of B. If Bs radius is x and Bs height is y. What is the difference between surface area of A and that of B.
Solution:
As suface 2pi^2 + pi2
Bs surface 2pix^2y + pi2xy
Difference = As - Bs
66.三角形, 有图, 一底角60度,另一底角45度角, 45度角所队边长10,求60度角所队边长为多少.
答案: 5根号6
67.某人去商店买东西,1/2买了a, 1/3 for b, 1/10 for c, and the rest $6 for candy. ask the total.
ans: 90 68.five letters d, i, i, g, t,排列组合,且两个i不相邻,求有多少种做法。
我的答案:36
69.坐标系中,有八个点, ; ;; ;
问从这八个点中任取一个点,x+2y0的概率是多少? 答案有1/8,1/4,etc
70.速度50miles per hour, if traveled 700feet, ask how many seconds used. 1mile=5280feet
71.81^x=1/, ask y in terms of x. ans: y=-4x/3
72.有一块地长15FEET,宽10FEET,用6INCH的SQUARE来铺,最少用多少块? --》我的答案是600
73.NK?
N 5K - 30
K30
我选的E
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