2016年AMC12真题PDF下载-B卷
1.What is the value of (2a-1+a-1/2)/a when a=1/2?
A.1
B.2
C.5/2
D.10
E.20
2.The harmonic mean of two numbers can be calculated as twice their product divided by their sum. The harmonic mean of 1 and 2016 is closest to which integer?
A.2
B.45
C.504
D.1008
E.2015
3.Let x=-2016. What is the value of | | |x|-x|-|x| |-x?
A.-2016
B.0
C.2016
D.4032
E.6048
4.The ratio of the measures of two acute angles is 5:4, and the complement of one of these two angles is twice as large as the complement of the other. What is the sum of the degree measures of the two angles?
A.75
B.90
C.135
D.150
E.270
5.The War of 1812 started with a declaration of war on Thursday, June 18,1812. The peace treaty to end the war was signed 919 days later, on December 24, 1814. On what day of the week was the treaty signed?
A.Friday
B.Saturday
C.Sunday
D.Monday
E.Tuesday
6.All three vertices of △ABC lie on the parabola defined by y=x2, with A at the origin and BC parallel to the x-axis. The area of the triangle is 64. What is the length of BC?
A.4
B.6
C.8
D.10
E.16
7.Josh writes the numbers 1,2,3,.....99,100 . He marks out 1, skips the next number (2), marks out 3, and continues skipping and marking out the next number to the end of the list. Then he goes back to the start of his list, marks out the first remaining number (2), skips the next number (4), marks out 6, skips 8, marks out 10, and so on to the end. Josh continues in this manner until only one number remains. What is that number?
A.13
B.32
C.56
D.64
E.96
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