作者ChenYM (老宅男一个)
看板Economics
标题[作业] 相关变化率
时间Wed Jun 19 18:55:34 2013
题目:
A country exports electronic components E and textiles T.
Suppose at a particular time t=t0 the revenue derived from
each of these goods is E(t0)=11 and T(t0)=8
and that E is growing at 9%, while T is declining at 2%.
At what relative rate is total export revenue R=E+T changing at this time.
我的想法:
一般相关变化率应该都会给dx/dt或dy/dt
这一题 都没给 怎麽算?
或是给了 但我没看懂?
请先进指教一下
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1F：推 Logic:那个9%跟2%不是变化率吗? 06/19 22:39