感谢奉献机经的G友！！！
欢迎大家跟帖讨论！
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1、14/3 (2/7+7/2) = ? 53/3 (这是我的第一题，很白痴，对吗？)
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53/3
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2、 ( 2*63^1/2 + 2/ (8+ 3*7^1/2) ) ^1/2 = ?
不知道大家能不能看懂，^1/2 表示根号，又是一道白痴题，答案是4。
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4
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3、There are 6 cards (from 1 to 6 ) in a bowl. Now take out one card from the bowl, then put it back, and then take out one card for the second time. The number of the sum is 8. Ask what is the probability that one of hte card is 5?
please pay attention to the sentence that put it back after the first time, that means it allows the repetition. the answer is 2/5.
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2/5
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4、 已知3^6x =8100, 求(3^(x-1))^3=?
我差一点死在这道题上，花了我七，八分钟，其实很简单，但是当时就是转不出来，一直在求X 的值，怎么也算不出来，急得我只差没有跳起来了，最后看了一眼要求的算式，才突然明白过来，现在想想都觉得后怕。 所以建议大家作不出来的时候，多看看题，也许就能柳暗花明！
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10/3
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5、Is x^3y^2z > 0 ?
1) xyz > 0
2) y> 0 C
这一题好像和以前的一道题很像，但是请注意所给的条件，和原来的不同，所以看机经是不能记答案，一定要掌握方法。
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C
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6、 某公司以一种价格(未知) 收购了一台电脑A，又以更高的价格卖出， 然后以相同的价格(A的收购价格) 收购了一台电脑B，又以更高的价格卖出，问A的 利润比B的利润多出多少个百分比？ (题目很长，大致是这个意思 )
1) A 的卖出价格比B 的卖出价格多15 个百分比。
2) B 的卖出价格比收购价格多$300。 (记不清了。)
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E
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7、 (有图)。A picture's ratio of length to width is 2:1, it is within a border with 2 inches on each side. If the area of the border is 192, what is the length of the picture? i am not sure about the number, but it is very easy.
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（2X +4）（X+4）-2X^2=196
求2X^2
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8、 In 1997, a company increased M percent of its cost of 1996, and in the same year (1997), the same company increased N percent of profit of 1996( where M>N ), ask the ratio of cost to profit in 1997 increased by how many percent than the ratio of cost to profit in 1996?
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（M-N）/（100+N）
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9、老机井:一个长方形照片，其length是width的两倍。照片周围有一圈board，board比照片多2 inch on each side, the area in this board is 196。问照片的长为多少？
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与第7题同
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10、a-b和a/b都是偶数，问下列哪个式子是奇数：
a+b/2，a/2，b/2，a+2/2，b+2/2。
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a+2/2，b+2/2。
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11、DS: two classes, A and B，下面是一张有关考试成绩的表格
mean medium
A 82 85
B 75 81
具体数字不是很确切，问两个班合在一起后 arithmetic mean 是否大于 median
条件1： a+b = 79
条件2： a = 42, b = 37
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E
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12、PS, One tried to paint the house, he needs choose something 2 of 4 first; and then, some other things 2 of 9. Ask for the combination.
Answer C2,4 * C2,9
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C4，2 *C9，2
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