HYC_Mock_1112_P2 (cont'd)

David joined a 10-km cycling competition. David rode the bicycle with the speed xkm/h from the starting point to the checking point and he went the speed (x-5)km/h from the checking point to the ending point. It is known that the checking point is in the middle between the starting point and the ending point.... 顯示更多 David joined a 10-km cycling competition. David rode the bicycle with the speed xkm/h from the starting point to the checking point and he went the speed (x-5)km/h from the checking point to the ending point. It is known that the checking point is in the middle between the starting point and the ending point. Finally, David spent 30 minutes to finish the whole competition. Find x
A. 23
B. (25 + 5sqt17)/2
C. 87/20
D. (32 + sqt409)/12

Given that a>b>0. Which of the following must be true?
I. log(b)a > 1
II. log(a)b > 0 (I dunno this)
III. log(b)ab = log(b)a + 1
() is the base

A bag contains 15 cards, each of the numbered 2 to 16. If 2 cards are drawn without replacement. find the probability that the sum of the numbers on the cards are even
A. 3/15
B. 7/15
C. 8/15
D. 11/15
更新: Why the equation of question 1 is = 5??? 5 is ???
2 個解答 2