\(\begin{array}{l} ƯCLN\left( {120;160;210} \right) \end{array}\)

Câu hỏi :

\(\begin{array}{l} ƯCLN\left( {120;160;210} \right) \end{array}\)

A. 10

B. 3

C. 5

D. 20

* Đáp án

A

* Hướng dẫn giải

 \(\begin{array}{l} ƯCLN\left( {120;160;210} \right)\\ 120 = {2^3}.3.5\\ 160 = {2^5}.5\\ 210 = 2.3.5.7\\ \Rightarrow ƯCLN\left( {120;160;210} \right) = 2.5 = 10 \end{array}\)

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