单项选择题

The sum of the first 50 positive integers is1，275．What is the sum of the integers from 51 to 100，inclusive（）

A. 2，525
B. 2，550
C. 3，25
D. 3，775
E. 5，050

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单项选择题

Of the positive integers that are multiples of 30 and are less than or equal to 360，what fraction are multiples of 12（）

A.A
B.B
C.C
D.D
E.E

单项选择题

3×104 is greater than 4×103 by what percent（）

A. 25%
B. 75%
C.
D. 650%
E. 750%

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