First, fill in. (65438+ 0 points per grid, 20 points)
1 and 30098400 are pronounced as (), and rounded to ten thousand digits is ().
2. In 1 ~ 15, the ratio of all even sums to all odd sums is (), and the ratio of all prime sums to all synthetic sums is ().
3.0.8=( ) :( ) = = 8÷( )=( )%
The volume of the cone is 76 cubic centimeters, and the bottom area is 19 square centimeters. The height of this cone is () cm.
5. If 4a=5b, then a: b = ().
6. The commonly used statistical charts we have studied are (), () and ().
7. In a right triangle, the ratio of two acute angles is 1: 2, which are () degrees and () degrees respectively.
You can choose four numbers from the divisor of 8. 12 to form a ratio. Please write two groups with different proportions: () and ().
9. If the distance between Party A and Party B is 4.8 cm on the map of 1: 500000, then the actual distance between the two places is () kilometers.
10. The radius of the bottom surface of the cylinder is 2 cm, and the side surface is exactly square. The volume of this cylinder is () cubic centimeters.