AMC 8 1985 Problem 1
AMC8 1985 年第 1 题
表达式与运算★☆☆☆☆
题干整理中
- A.1
- B.0
- C.49
- D.
- E.50
正确答案 · Correct Answer
A
解析 · Solution
Solution 1
By the commutative property:
Notice that the 9×11 in the denominator of the first fraction cancels with the same term in the second fraction, the 7 s in the numerator and denominator of the second fraction cancel, and the 3×5 in the numerator of the first fraction cancels with the same term in the denominator second fraction. Then everything in the expression cancels, leaving us with 1.
Thus, the answer is 1, or 1
Notice the two fractions are multiplied, so we can consider them as 1 fraction. All terms cancel out, leaving us with 1.
This fraction can be simplified to The numerator and denominator are the same, so the answer is 1.
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