Fill in the blanks in the first grade of junior high school mathematics! Solve!

1. If you walk 5 meters to the east, it is marked as +5 meters, and if you walk 10 meters to the west, it is marked as-10 meters.

2. comparison size: _ _ _ _ _ (fill in ">" or "

3. It is reported that the fiscal revenue of our city in 2006 was 1.80 billion yuan, which was expressed as the 9th power of 1.8 * 10 by scientific notation.

Please write a cubic monomial with a coefficient of 5 with two letters:.

5. Given the natural cardinal number = 2.7 1828 ..., the result of retaining three significant digits of this number is 2.72.

6. As shown in figure 1, the corner ABCD ∠ ABC = 120, ∠ BCD = 60,

Then there must be a pipeline AB‖CD, which is based on the complementary internal angles on the same side and the two straight lines are parallel.

7. If and are similar items, then m = _ _ _ _ _

8. As shown in Figure 2, the right-angle vertices of two triangular plates are overlapped. If ∠ L = 42O, then ∠ 2 = _ _ _ _.

9. As shown in Figure 3, please describe the direction of light OA: 30 degrees east of due north.

10. In the slogan "Welcome to Beijing" of Beijing 2008, the frequency of the letter "e" is _ _12.5% _ _.

Click on the picture to enlarge.