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AMC10 2011 B

AMC10 2011 B · Q1

AMC10 2011 B · Q1. It mainly tests Manipulating equations, Fractions.

What is $\frac{2 + 4 + 6}{1 + 3 + 5 - 1 + 3 + 5} - \frac{2 + 4 + 6}{?}$
什么是 $\frac{2 + 4 + 6}{1 + 3 + 5 - 1 + 3 + 5} - \frac{2 + 4 + 6}{?}$
(A) -1 -1
(B) 5 5
(C) $\frac{7}{12}$ $\frac{7}{12}$
(D) $\frac{147}{60}$ $\frac{147}{60}$
(E) $\frac{43}{3}$ $\frac{43}{3}$
Answer
Correct choice: (C)
正确答案:(C)
Solution
Answer (C): The given expression is equal to $12 / (9 − 9/12) = 4 / (3 − 3/4) = 16 − 9 / 12 = 7/12$.
答案 (C):给定的表达式等于 $12 / (9 − 9/12) = 4 / (3 − 3/4) = 16 − 9 / 12 = 7/12$。
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