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AMC12 2011 B

AMC12 2011 B · Q1

AMC12 2011 B · Q1. It mainly tests Fractions.

What is $\frac{2+4+6}{1+3+5} - \frac{1+3+5}{2+4+6}?$
$\frac{2+4+6}{1+3+5} - \frac{1+3+5}{2+4+6}$ 的值是多少?
(A) -1 -1
(B) \dfrac{5}{36} \dfrac{5}{36}
(C) \dfrac{7}{12} \dfrac{7}{12}
(D) \dfrac{147}{60} \dfrac{147}{60}
(E) \dfrac{43}{3} \dfrac{43}{3}
Answer
Correct choice: (C)
正确答案:(C)
Solution
Add up the numbers in each fraction to get $\frac{12}{9} - \frac{9}{12}$, which equals $\frac{4}{3} - \frac{3}{4}$. Doing the subtraction yields $\boxed{\frac{7}{12}\ \textbf{(C)}}$
把每个分数中的数相加,得到 $\frac{12}{9} - \frac{9}{12}$,即 $\frac{4}{3} - \frac{3}{4}$。相减得 $\boxed{\frac{7}{12}\ \textbf{(C)}}$。
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