a: \(852=2^2\cdot3\cdot71\)
\(192=2^6\cdot3\)
\(ƯCLN\left(852;192\right)=2^2\cdot3=12\)
b: \(900=3^2\cdot2^2\cdot5^2\)
\(420=2^2\cdot3\cdot5\cdot7\)
\(240=2^4\cdot3\cdot5\)
Do đó: \(ƯCLN\left(900;420;240\right)=3\cdot2^2\cdot5=60\)
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