[問題] 請問兩題有關PP的數學
這是PP1的第142題
The rate of a certain chemical reaction is directly proportional to the square
of the concentration of chemical A present and inversely proportional to the co
ncentration of chemical B present. If the concentration of chemical B is incre
ased by 100 percent, which of the following is closest to the percent change in
the concentration of chemical A required to keep the reaction rate unchanged?
(A) 100% decrease
(B) 50% decrease
(C) 40% decrease
(D) 40% increase
(E) 50%
ans:D
第二題為PP2的第117題
There are 8 magazines lying on a table; 4 are fashion magazines and the other 4
are sports magazines. If 3 magazines are to be selected at random from the 8
magazines, what is the probability that at least one of the fashion magazines w
ill be selected?
(沒有選項及答案XD)
請知道如何解這兩題的大大幫個忙
謝謝^^
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 114.44.102.33
推
02/24 22:24, , 1F
02/24 22:24, 1F
→
02/24 22:26, , 2F
02/24 22:26, 2F
→
02/24 22:30, , 3F
02/24 22:30, 3F
推
02/24 22:39, , 4F
02/24 22:39, 4F
→
02/24 22:42, , 5F
02/24 22:42, 5F
→
02/24 22:43, , 6F
02/24 22:43, 6F
GMAT 近期熱門文章
PTT職涯區 即時熱門文章
