以下是数学JJ，先想了这么多。 1. 两个地方的人口 近似到 10,000 是, A: 140,000; B: 80,000, 问这两个地方的总人口加起来近似到10，000有多少？ 1) For both of these 2 places, the rounded number is within 2% 2) A place number was rounded up, B place number was rounded down 这道题我算了挺久的，我记得我选了A
2. Below shape formed by 5 rectangles of same dimention. the area of ABCD is 240, what’s the perimeter of ABCD 此题容易，细心算即可，我不知道怎么样贴图，就是左右各两个矩形站着，中间3个叠起来，形成一个大的矩形，可以推出每个矩形的长是宽的3倍（以前有类似的提，不过是4个矩形 ）
3. n + k < 8, how many different combinations of nk? 我记得好像是10种
4. (X^2-25)^2 = (x-5)^2, how many real numbers of x? 容易
5. Joan is planning a trip according to her estimation of speed for a certain distance. Is her planned time within 5 hours of the actual time taken? 1) Her actual speed is 5 miles/hour less than her planned speed 2) The actual distance she drove is 10 miles greater than her planned distance 这题我也是算了一段时间，我选了E
6. In x-y plane, y axis intercept of line k is less than -2, the point k intercepts with x axis is to the right of (3,0)? 1) Line k passes point (2,3) 2) Slope of line k is ½ 容易
7. is the prime factor of 2 X 3^3 X 5^2 + 3^2 X 5^2 （数字记不清了）, what’s the maximum of P? (选项有5, 7, 11, 17, 23)， 我记得是选17。我是把那个数算出来（记得是1530），然后对照选项，我觉得这样更快，
8. x-y < =1; 2x + y <= 5, which of the following is true?选项： The maximum of x is 2 The minimum of x is 1 The minimum of y… 此题我用了图形法，当时还挺得意，现在发现加加减减就可以了，选A
两个地方的人口 近似到 10,000 是, A: 140,000; B: 80,000, 问这两个地方的总人口加起来近似到10，000有多少？ 1) For both of these 2 places, the rounded number is within 2% 2) A place number was rounded up, B place number was rounded down 这道题我算了挺久的，我记得我选了A
请问LZ这题是什么思路呢？the rounded number is within 2%作何理解呢？
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发表于 2009-8-25 22:12:00
is the prime factor of 2 X 3^3 X 5^2 + 3^2 X 5^2 （数字记不清了）, what’s the maximum of P? (选项有5, 7, 11, 17, 23)， 我记得是选17。我是把那个数算出来（记得是1530），然后对照选项，我觉得这样更快，
