The least common multiple of 11 and 13 is () times their greatest common factor

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1. Find the greatest common factors 32 and 72, 75 and 25, 80 and 125, 40 and 60, 17 and 51, 14 and 54 of each group And what did you find
2. 32 and 72, 75 and 25, 80 and 125, 40 and 60, 17 and 51, 14 and 54. What do you find
3. 42, 45, 40, 47 (), (), 36, 51, Don't write what I don't understand, write the formula
4. 36,9,42, (), (), 51, () can only add and subtract. Please explain the solution
5. In the fifth grade, oral arithmetic is practiced every day from 42 to 45, 51 to 54
6. Calculation: 108 ° 18 ′ - 56 ° 23 ′=______ ．
7. How to solve 108 ° 18 ′ + 56 ° 23 ′ 40 ″,
8. The solutions of 108 ° 18 '- 56 ° 23' are expressed in degrees
9. 108°18′+56°23′40〃
10. Among the numbers 3, 15, 22, 51, 78, 60, 83, 210, 29 and 56, odd numbers are: even numbers are: prime numbers are: composite numbers are: multiples of 2 The multiples of 3 are: the numbers with factor 5 are () the numbers with 2, 3 multiples are () the numbers with 3, 5 multiples are () the numbers with 2, 3, 5 multiples are () at the same time（
11. The greatest common factor and the least common multiple of 11 and 13
12. The greatest common factor and the least common multiple of 11 and 3
13. Simple calculation of primary school 51 * 1 -- 6 / 0.9
14. 4.9 * 6.8 + 0.51 * 6.8
15. 0 1 3 9 ) 51 The answer is 21
16. What are the numbers in brackets? A, 1 B, 10 C, 53 D, 130
17. Please fill in the most likely numbers in brackets: 3,7,21,51103, () Please give the derivation process
18. In order to make 51 () fill in this number, it has both factor 2 and factor 3. What number can () fill in
19. 1 / 3 () 1 / 3 () 1 / 3 = 2 / 9 can be filled with brackets and operation symbols
20. Fill in the operation symbol or bracket. 5 = 2