2. The greatest common factor of18 and 45 is (), and their least common multiple is ().

3. The sum of all the simplest true fractions with denominator of 6 is (), and there is () in 2.

4, === 12÷( )= () (decimal)

5. There are 29 boys in Class 5 (4), and 6 girls are less than boys. Eight students in the class were rated as three-good students, and three-good students accounted for all the students.

6, 45 minutes = () hours 28 hectares = () square kilometers.

/kloc-factor of 0/8

Factor of 24

/kloc-common factor of 0/8 and 24

7、 1○ , ○, ○,>( )>,