129. 4-4平方分之一
SA: 15/16
129.
129题可能是GWD13-8
At a certain food stand, the price of each apple is ¢ 40 and the price of each orange is ¢ 60.
Mary selects a total of 10 apples and oranges from the food stand, and the average
price of the 10 pieces of fruit is ¢ 56. How many oranges must Mary put back so that the average price of the pieces of fruit that she keeps is ¢ 52?
A. 1
B. 2
C. 3
D. 4
E. 5
The answer is E
130. DS:一串数列求标准差:
最大数等于平均数
range为零
SA:D 大家帮我确认一下
131. 一个卫星绕木星 卫星离木星的地心5800哩 卫星离木星的表面3700哩
求木星圆周长?
SA:4200 PAI
132. 又是委员会问题^^:
a有五人 b有四人 c有三人
ab个各取两人 c取一人的取法有几种??
SA: 180
133.DS:
xy+z=z, Ix-yI0? x-y的绝对值是否大于零
1. x不=0
2. y=0
SA:A
134. x^2-6xy+9y^2-14=0
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