Second,10012.50000.000000000805

Three, 30 is a multiple of five categories, 10, 15, 20, 30.

The least common multiple of the multiples 3, 6, 9, 15, 12, 18, 24, 27, 2 13, 5 of class 30 3 is 15.

1, 2, 6, 9, 18, 3 15. The greatest common factor of 1, 3, 5,15 and 8 is 3.

Five, 15cm, twice, 3060.830.008.

Sixth, take the seat 3 1.32.33.