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整数的性质   题数:218
A certain company had an annual profit of $15 million in 1998 and an annual profit of $20 million in 1999. In 2000 the company had an annual loss of $5 million. What was the company's average (arithmetic mean) annual profit for the 3 years?
A grocery store purchased crates of 40 oranges each for $5.00 per crate and then sold each orange for $0.20. What was the store's gross profit on each crate of oranges?
IF(15 )m(14 )18=12(10)35 ,then m=
For every positive even integer n, the function h(n) is defined to be the product of all the even integers from 2 to n, inclusive. If p is the smallest prime factor of h(100) + 1, then p is
The product P of two prime numbers is between 9 and 55. If one of the prime numbers is greater than 2 but less than 6 and the other is greater than 13 but less than 25, then P =
If n is the product of the integers from 1 to 20 inclusive, what is the greatest integer k for which 2k is a factor of n?
How many three-digit numbers begin with a digit which represents an odd number that is a prime, have a prime number as a second digit, and end with a digit that represents an odd number?
In an increasing sequence of 10 consecutive integers, the sum of the first 5 integers is 560. What is the sum of the last 5 integers in the sequence?
【OG20-P146-5题】A certain restaurant that regularly advertises through the mail has 1,040 cover letters and 3,000 coupons in stock .In its next mailing ,each envelope will contain 1 cover letters and 2 coupons .If all of the cover letters in stock are used ,how many coupons will remain in stock after this mailing?
If n is a positive integer less than 200 and 14n/60 is an integer, then n has how many different positive prime factors?
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