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AMC10 2002 A

AMC10 2002 A · Q1

AMC10 2002 A · Q1. It mainly tests Fractions, Powers & residues.

The ratio $\frac{10^{2000} + 10^{2002}}{10^{2001} + 10^{2001}}$ is closest to which of the following numbers?
比例 $\frac{10^{2000} + 10^{2002}}{10^{2001} + 10^{2001}}$ 最接近于下列哪个数?
(A) 0.1 0.1
(B) 0.2 0.2
(C) 1 1
(D) 5 5
(E) 10 10
Answer
Correct choice: (D)
正确答案:(D)
Solution
(D) We have $$ \frac{10^{2000}+10^{2002}}{10^{2001}+10^{2001}} =\frac{10^{2000}(1+100)}{10^{2000}(10+10)} =\frac{101}{20}\approx 5. $$
(D)我们有 $$ \frac{10^{2000}+10^{2002}}{10^{2001}+10^{2001}} =\frac{10^{2000}(1+100)}{10^{2000}(10+10)} =\frac{101}{20}\approx 5. $$
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