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请翻译并求解几道GMAT数学题
翻译并求解几道GMAT数学题,请写出解题步骤,谢谢
(1)y=(x-1)(1-k/2)+(2-k)x/2, 这条直线的斜率是多少? (2) n是正整数,2n=2×4×6×8×(2n-2)×2n,求(20)+(22)最大的质因数是多少? (3)六组人每组三人互相握手,同组之间不握手,不重复握手,共握多少次? (4)问r、s、t的标准方差与以下哪个一样? I. r-2,s-2,t-2 II. 0 ,s-t, s-r III r+3, s+3, t+1 (A) I (B) II (C) III (D) I&II (E) I&III
(5) A cube is composed of several smaller cubes. What is the least number of the smaller cubes? (6) Dawn has twice as many as 25 cent coins as 10 cent coins and twice as many 10 cent coins as 5 cent coins.问25 cent coins 的value 比5 cent coins的value是多少? (A)4:1 (B)5:1 (c)20:1 (10)一个盒子中有1个红色苹果,3个绿色苹果,先拿出一个苹果,再拿出一个苹果,两次都不放回,求2个都是绿苹果的概率。 (11)1-100之间,7150有几个质数因子? (12)1≤n≤99,what is the possibility of n(n+1) is a multiple of 3? |
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