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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 | 
