There are two numbers that are coprime numbers and composite numbers. Their least common multiple is 90. These two numbers are () A. 9 and 10B. 2 and 45C. 6 and 15d. 5 and 18

There are two numbers that are coprime numbers and composite numbers. Their least common multiple is 90. These two numbers are () A. 9 and 10B. 2 and 45C. 6 and 15d. 5 and 18

A. 9 and 10, these two numbers are compound numbers and coprime numbers, and their least common multiple is 90; B, 2 and 45, 2 are prime numbers and 45 are composite numbers, which do not meet the requirements; C, 6 and 15 are composite numbers, which do not meet the requirements; d.5 and 18, 5 are prime numbers, which do not meet the requirements; therefore, a

Given that the least common multiple of the number of two coprime is 105, what is the number of the two coprime?
kuai kuai kuai

There are four groups: 1 and 105, 3 and 35, 5 and 21, 7 and 15

Given that two numbers are coprime, the least common multiple 70, how many such numbers are there?

You can decompose the 70 factors first
70=2x5x7
So there are four pairs
1 and 70
2 and 35
5 and 14
7 and 10