求助!!!!!!!!!!!

hijenny · 发表于 2010-8-4 22:39:34

214. 20789-!-item-!-187;#058&013258

The cost of a square slab is proportional to its thickness and also proportional to the square of its length. What is the cost of a square slab that is 3 meters long and 0.1 meter thick?

(1) The cost of a square slab that is 2 meters long and 0.2 meter thick is $160 more than the cost of a square slab that is 2 meters long and 0.1 meter thick. ?

(2) The cost of a square slab that is 3 meters long and 0.1 meter thick is $200 more than the cost of a square slab that is 2 meters long and 0.1 meter thick.

選D
算這題要算很久
有戰友知道快的解法嗎??

hijenny · 发表于 2010-8-4 23:34:07

頂起來

jiajiayyyy · 发表于 2010-8-4 23:41:38

这道题主要是转化。
可以将题目简化为：c=k*t*l^2. 对于这个函数，只要求出k，那么就可以得到需要回答的问题。
ds考察的不是让你得出标准的答案，而是在问，如果想得到答案，条件是否充分。
显然可以分别通过1），2）得出k，那么就是d

举例说：1）k*(2^2＊0。2-2^2*0.1)=60, 不需要求解便可得知k，一元一次方程。同理2。

zhaoduo · 发表于 2010-8-5 01:32:12

这用很久么？？？很明显一个是厚度变化一个是长度的变化啊

求助!!!!!!!!!!!

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