2 x 2 x 5 x 7 x 11 = 1540
2 * 2 * 5 * 7 * 11 = 1540
1540 has the prime factorization of 2 times 2 times 5 times 7 times 11
1540
is it 60*2 30*2*2 15*2*2*2 5*3*2*2*2 so the greatest common factor is 2! OR .....................121 ....................../\ ..................11. 11 11 is prime. (remove the dots)
It is: 14/55
(7 - 2√5)(11 + √5) = (7 × 11 + 7 × √5) + (-2√5 × 11 + -2√5 × √5) = 77 + 7√5 - 22√5 - 2 × 5 = 67 - 15√5
55 / 11 + 7 * 2 + 14 55/11 = 5 7 * 2 = 14 Therefore, 5+14+14=33
2•2•5•3•7•11=4,620 
6468
2/5 - -11/7 = 69/35
LCM(2, 5, 7, 11) = 770.
2*2 = 4 * 3 = 12 * 5 = 60 * 5 = 300 * 7 = 2,100