1. The common factors of numbers A and B are 3, 3 and 5, the unique common factors of numbers A are 2 and 3, and the unique common factor of numbers B is 7, so the greatest common factor of numbers A and B is (b: 3× 3× 5 = 45) and the smallest common multiple is (d: 45× 2× 3× 5).

A.3

b45

C.90

D. 1890

2. It is known that A and B are two non-zero continuous natural numbers, so their greatest common factor is (A: 1) and their smallest common multiple is (D: A× B).

A. 1

bachelor of arts

CB

D.a×b .

3.a and b

The greatest common factor of two numbers is 30, the unique prime factor of number A is 5, and the unique prime factor of number B is 7, so number A is (a: 150) and number B is (d: 2 10).

A. 150

1050

C.30

D.2 10

4. If A =3× 19 and B =5×7× 1 1, then the greatest common factor of A and B is (C: 1) and the smallest common multiple is (D: 3× 5× 7× 65438+.

Answer/no

B.0

C. 1

d . 3×5×7× 1 1× 19