<p>不好意思因为不懂如何把图片贴上去。。。。</p><p>不明白到底那个D(p)是数量还是需求，如果是需求是不是还要乘多一个p后才能算D'(p)？</p><p>麻烦各位了，感激不尽</p><p></p><p>The price-demand function for calculators is given by<br/> <br/> D(p)=100000/(p^2+10p+50)</p><p>where D is the quantity demanded and p is the unit price in dollars.</p><p>(a) Find D'(p), the rate of change of demand with respect to price.<br/>(b) Find D'(5), D'(10), and D'(15).<br/>(c) Interpret the results found in part (b).<br/></p>

[此贴子已经被作者于2009-3-20 0:08:42编辑过]