A.12
B.14
C.18
D.20
E.22
答案:C
5.The sum of the first 50 positive integers is 1275. What is the sum of the integers from 51 to 100, inclusive?
A.2525
B.2550
C.325
D.3775
E.5050
答案:D
6.The numbers in a table are arranged in 10 rows and 4 columns such that one number is placed at the intersection of each row and column. How many numbers are contained in the table、
A.14
B.40
C.400
D.104
E.410
答案:B
7.In how many of the integers between 1 and 100 does the digit 5 occur exactly once?
A.10
B.18
C.19
D.20
E.21
答案:B
8.If n is any prime number greater than 2, which of the following cannot be a prime number?
A.n-4
B.n-3
C.n-1
D.n+2
E.n+5
答案:E
9.If the range of the six measurements 140, 125, 180, 110, 165, and x is 80, which of the following could be the value of x?
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