[考古] 96淡江三年級
6.A manufacturer of digital clocks determines that he can sell x clocks per
week at price p where x and p are related by the equation
x^2+3xp+p^2=4400.
This equation determines demand as a function of price,x=Q(p), near the
point (p.,x.)=(40,20) ---("."為下標0)
(a) If price is increasing at the rate of 50% per week how fast is demand
changing when p=$40?
(b) Find dx/dp at the point (p.,x.)=(40,20)
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