Q： for the function f(X)=3√x(x-7)² which of the following statements are true ? f (0) = 0 is a relative minimum f (x) is differentiable everywhere f (7) = 0 is a relative minimum f (x) has no relative maximum 答： f(7) = 0 is a relative minimum Q1： LET A= ∫ (IN X)2 dx 答 ： A1 A 2 B0 A 1 CA 0 DA = 0 The answer is B. 0 A 1 Q2： Let a=∫1 0 x5(1-x3)1/3 dx，then 答：0A1 Q3： Suppose the demand and supply functions for a certain goods are given by: QD=10-P QS=P-4 Find the total economic surplus generated at the market equilibrium 6.0 10.5 4.5 9.0 A ： 9.0 For implicit function 2xy+ex+y -2=0 dy/dx (0,ln2)=? -1 - ln2
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