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广西龙网_原题为 AMC8 -- 2000年真题解析
Problem 1
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Answer: B
Solution:
Since Brianna is half of Aunt Anna's age this means that Brianna is 21 years old. Now we just find Caitlin's age by doing 21-5=16.Problem 2
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Answer: A
Solution:
The number 0 has no reciprocal, the reciprocal of 1 is 1, the reciprocal of -1 is -1. This leaves only 2 ,-2. The reciprocal of 2 is 1/2, but 2 is not less than 1/2. The reciprocal of -2 is -1/2, -2 is less than-1/2, so it is A.Problem 3
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Answer: D
Solution:
The smallest whole number in the interval is 2 because 5/3 is more than 1 but less than 2. The largest whole number in the interval is 6 because 2Pi is more than 6 but less than 7. There are five whole numbers in the interval. They are 2,3,4,5,6, so the answer is D.Problem 4
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Answer: E
Solution:
The data are 1990(5%), 1970(8%), 1980(15%) ， and 1990(30%). Only one of these graphs has the answer and that is choice E.Problem 5
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Answer: C
Solution:
If the first year of the 8-year period was the final year of a principal's term, then in the next six years two more principals would serve, and the last year of the period would be the first year of the fourth principal's term. Therefore, the maximum number of principals who can serve during an 8-year period is 4.Problem 6
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Answer: A
Solution:
Solution: A (area)
The shaded area can be divided into three regions: one small square with side 1, and two rectangles with a length and width of 1 and 3. The sum of these three areas is 1*1+3*1+1*3=7.Problem 7
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Answer: B
Solution:
The only way to get a negative product using three numbers is to multiply one negative number and two positives or three negatives. Only two reasonable choices exist: (-8)*(-6)*(-4)=-192 ; (-8)*5*7=-280. The latter is smaller, so the answer is 280.Problem 8
稿源：(艾蕾特教育)
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