好多题，有劳大家了，谢谢
补充材料
541 A computer is programmed to generate a list of multiples of prime numbers 2,3 and 5,as shown below:
Program 1-list multiple of 2
2- 3
3- 5
how many integers less than 100 will appear on all of the lists of programs produced above?
534 DS if the number of square units in the area of a circle is A and the number of linear units in the circumference is C,what is the radius of the circle? （不明白题意）
(1) A/C=3/2
(2) A>C+3
510 DS what is the 1st term in sequence S?
(1) the 3rd term in S is 2
(2) the 2nd term in S is twice the 1st ,and the 3rd term is three times the 2nd
498 a merchant sells an item at a 20 percent discount,but still makes a gross profit of 20 percent of the cost .what percent of the cost would the gross profit on the item have been if it had been sold without the discount?
491 of the following ,which best approximates(0.1667)(0.8333)(0.3333)/(0.2222)(0.6667)(0.1250)
answers: 2.00 2.40 2.43 2.50 3.43
492.two searchlights S1 and S2 are located 10,000 feet apart,each covers and area of radius 10,000 feet, and each is located 8,000 feet from the railroad track.To the nearest 1,000 feet,what is the total length x of track spanned by the seachlights?
482.what is the least number of digits (including repetitions)needed to express 10^100 in decimal notation? （不明白题意）
[em21][em20][em21][em07][em07][em28]作者: andrewcan 时间: 2002-11-9 03:53
491: 2.5 change the decimals to fractions: ie. 0.1667= 1/6, 0.8333 = 1/1.2....
492: 24,000, to draw a picture, it will be much clearer. you will find out the answer is 4 X 6,000 ---------> 24,000
482: I think "number of digits" mean: 3 in 10^2( =100); 5 in 10^4( =10000)
so 10^100 ----101.作者: nan 时间: 2002-11-9 09:06
492)
my answer is 10,000+2*6,000=22,000作者: nan 时间: 2002-11-9 09:35
489)
i don't know that wrong with me but my answer is 50%作者: lnlynn 时间: 2002-11-9 17:44
