探讨SAT1数学解题方法
时间:2008-12-10点击:
例如:
Figure I Figure II Figure III
Figures I and II above show two stacks of identical pails and their heights. If n is the number of pails in a stack and n>1, the height of the stack , in inches, is given by h(n)=2n+8. The number 2 in the equation represents what quantity shown in Figure III?
(A) a, the height of one pain
(B) b, the height of the overlap of two pails
(C) c, the distance between the top of one pail and the top of the next pail in the stack.
(D) d, the diameter of the bottom of each pail
(E) e, the volume of the bottom pail that remains after the second pail is stack on top of it.
在英文环境下,很多国内考生大脑就忙不过来了——需要经过对考题翻译,然后转化为数学知识,因为翻译是隐性的,许多考生脑子就卡壳了。其实如果翻译成中文,这道题顶多会放在国内高二学生数列部分的基础练习部分。但是因为SAT不考等差等比数列,这道题的情景也是比较简单的,因为很容易观察到四个桶比三个桶多一个c,五个桶比四个桶多一个c,而从h(n)=2n+8里我们知道,h(4)比h(3)多的就是系数2,h(5)比h(4)多的也是系数2,所以这道题用观察法就可以得到了。






