Re: [計量] 10月數學機經的疑問
: : 4. Given Principal amount P,rate of interest was r ,and the amount increase
: : from 1990 to 1995 and 1995 to 2000 each time by r%. so the total amount was
: : (7/5)p at the end of 2 yrs .
2000 yrs?
: : Col A : r
: : Col B: 20
: : Ans:B （我覺得題目給的條件不夠充分，所以算不出來??）
不是很確定
P(1+r%)(1+r%)=(7/5)P=(1+20%)P
=> (1+r%)(1+r%)=(1+20%) => r<20
: : 12. Given X^-1=2/y^2+1
: : col a : x
: : col b : y^2/2
: : Ans: A (我算不出這個答案)
: 兩數M-N>0, 倒數應該是1/N > 1/M
X^-1 > 2/y^2 => x < y^2/2 ???
: : 13. A parabola was draw and a point on it was given as P(2,K)and it was cuting
: : the Y axis at a point below 2 .ie. it was open upwards the distance was asked
: : between th point P and the point where the parabola cuts th y axis.
: : a:3
: : b:7
: : c:2sqroot(5)
: : d:2sqroot(7)
: : e:3sqroot(3)
: : Ans:找不到答案
: : 14. What is the probability for particular year between 1987 and 1992 to have
: : 53 Sunday?
: : Ans. 2/7 (我算不出這個答案)
: : 15. Given dat x*=(x-1)/x condition is x<0 not necessary find which of
: : the following is true?
: : a)2x*=2(x*)
: : b)-x*=x*
: : c)(x-1)*/x=x*...
: : d)(x*)*=x
: : Ans:找不到答案
: 累了，剩下13~15交給下一位好了.....抱歉
13~15好難><
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