НОД (450 и 720), НОД(855 и 945)
450 = 2•3•3•5•5 720 = 2•2•2•2•3•3•5 НОД(450, 720) = 2•3•3•5 = 90 855 = 3•3•5•19 945 = 3•3•3•5•7 НОД(855, 945) = 3•3•5 = 45