10. Is x<0? a) x^3 + x < 0 b) x^3 + x + 1 = 0 【讨论】A,因为B方程无解。 绿茶答:d 21) @ can be indicated plus, subtract, and product. what's the value of 1@0? a. 0@2= 2 b. 2@0= 2 A; A Answer: A
绿茶答:d because from 2@0 ,we can get that @ is plus or subtract, then 1@0=1 whenever @ is plus or substract. 25) x, y, z are primes, x^3*y^3*z^3=? a) x^3*y*z=728; b)x^2=... (A) Answer: E
绿茶答:a because x,y,z are primes , then x=2, yz=91=13*7 26) 53 is the standard deviation of T(一数列) greater than S(一数列) ? (1) mean of T is greater than that of S (2) median of T is greater than that of S Answer: a 绿茶答:e 30)教A的教授有X名,教B的教授有Y名,但为了MONEY到外校教比率? 1.A中有1/2 到外面任教 2。A中到外面任教的是B中的3倍E Answer: E 绿茶疑问:该题是不是因为从所给的信息中,得不到具体的数值,答案所以为e呢?是不是应该为c呢,也就是比率=(x-x/2+x/2/3)/x+y 38)x is a two digital number, ask whether the tenth digit of x less than 4? 1. tenths of 2x is 7 2. 2unit of 2x is less than the unit of x 【确认】A