1.2045 million write (), and the mantissa after omitting 10,000 is () million.

2.80.07 cubic meters = () cubic meters () cubic decimeter 2 hours and 40 minutes = () hours.

3.( ):( )=0. 125=( )%=( )=

4. The ratio of A to B is 7: 2, B is 70 and A is ().

5. Write the simplest true score (), with a smaller proportion and a larger proportion.

6. After the decimal point of a number is shifted one place to the right, the number obtained is 27.9 larger than the original one, and one number is ().

7. Form a rectangle with 36 cm wire, and the length-width ratio is 5: 4. The area of this rectangle is ().

8.: The simplified ratio is () and the ratio is ().

9. The ratio of boys to girls in a class is 5: 4. There are ()% more boys and ()% fewer girls than boys in this class.

10. A square with a side length of 6 cm. Draw two largest semicircles in this square. The area of a semicircle is () square centimeters.