Răspuns :
[tex]\it 28=2^2\cdot7\\ \\ 42=2\cdot3\cdot7\\ \\ 63=3^2\cdot7\\ \rule{70}{0.7}\\ \\ \ [ 28,\ 42,\ 63 ]=2^2\cdot3^2\cdot7=4\cdot9\cdot7=[/tex]
[tex]\it 28=2^2\cdot7\\ \\ 42=2\cdot3\cdot7\\ \\ 63=3^2\cdot7\\ \rule{70}{0.7}\\ \\ \ [ 28,\ 42,\ 63 ]=2^2\cdot3^2\cdot7=4\cdot9\cdot7=[/tex]