『每日答題系列集中串』~(不一定日更,善用google, 回文40%)

asd012369

【題目】 A simple linear demand function may be stated as Q= a-bP+cI where Q is quantity demanded , P is the product price, and I is consumer income. To compute an appropriate value for c, we can use observed values for Q and I and then set the estimated income elasticity of demand equal to.


ANS : c(I/Q)

小宇唷

【題目】If the quantity demanded increase as peoples incomes increase, the result of

ANS: a normal good.

ycknews

The most fundamentaleconomic problem is
  reducing unemployment.
  decreasing the inflation rate.
  health and health care.
  scarcity.


答案

       scarcity.

小宇唷

【題目】 Bonds that have an option exercisable by the issuer to retire them at a stated dollar amount prior to maturity are known as:


ANS : Callable bonds.

ycknews

Which of the following is the amount a person would invest now to receive a greater amount in the future?
  Stated interest rate
  Market interest rate
  Present value
  Future value


答案:C

Present value

小宇唷

【題目】 If the quantity demanded increase as peoples incomes increase, the result of

ANS : a normal good.

asd012369

【題目】 A simple linear demand function may be stated as Q= a-bP+cI where Q is quantity demanded , P is the product price, and I is consumer income. To compute an appropriate value for c, we can use observed values for Q and I and then set the estimated income elasticity of demand equal to.

ANS : c(I/Q)

小宇唷

【題目】Suppose the demand for gourmet coffee can be represented by a linear demand curve. When income rises cause the demand curve for gourmet coffee shift to the right parallelly:


ANS : becomes less elastic at the price that prevailed before the change in income

ycknews

The most fundamentaleconomic problem is
  health and health care.
  decreasing the inflation rate.
  reducing unemployment.
  scarcity.

答案: scarcity.

小宇唷

題目

ANS : 0<A<1

ycknews

Consumer surplus is:
  the difference between the substitution and income effect
  the difference between the price one is willing to pay and the price one has to pay
  the price one is willing to pay divided by its actual price
  negative for an inferior good


答案: the difference between the price one is willing to pay and the price one has to pay

HuangRance

yapc1728 發表於 2019-12-3 09:57
【題目】 for the function f(X)=3√x(x-7)²
which of the following statements are true ?
  f (0) = 0  ...

【題目】 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
答案怪怪的
今日題目:
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 (7) = 0 is a relative minimum
f (x) is differentiable everywhere
f (x) has no relative maximum

【譯文】
  對於函數f（X）=3√x（x-7）² 下列哪個陳述是正確的？
   f（0）= 0是相對最小值
   f（7）= 0是相對最小值
   f（x）隨處可微
   f（x）沒有相對最大值
====================================================
轉換成javascrit的程式碼如下:
function f(x){return Math.cbrt(x*Math.pow(x-7,2));}
那  f(-3)=3√-3*(-3-7)*(-3-7)= 3√-300=-6.6943295008216952188265932463993
其實簡單驗算可以得知,只要x<0都可以開立方根,有負數解,解可以趨近無限小
同理,只要x>0都可以開立方根,有正數解,解可以趨近無限大
那答案應該比較像f (x) has no relative maximum  f（x）沒有相對最大值 ,而我答這個,結果是錯的,然道答案是f (x) is differentiable everywhere  f（x）隨處可微,跑程式可得比0小的值,應該不是 f (0) = 0 is a relative minimum  f（0）= 0是相對最小值 , f (7) = 0 is a relative minimum  f（7）= 0是相對最小值!!!

ycknews

【題目】 A simple linear demand function may be stated as Q= a-bP+cI where Q is quantity demanded , P is the product price, and I is consumer income. To compute an appropriate value for c, we can use observed values for Q and I and then set the estimated income elasticity of demand equal to.
  c(I／Q)
  c(Q／I)
  -b(I／Q)
  Q／(cI)


答案:A
c(I／Q)

disma

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