1. When you look in the mirror, when you blink your left eye, the image in the mirror will blink.
February and March 12 is Arbor Day. Class 1 and Class 2 of Grade 7 participated in tree planting activities. Class one planted a tree, Class two planted more B trees than Class one, and Class two planted a tree.
Xiao Ming's height is about 165.0 cm, and the effective figure of this approximate figure is.
The mascots of Beijing 2008 Olympic Games are Beibei, Jingjing, Huanhuan, Yingying and Nini. Now, put three cards (the same shape, size and texture) printed with the mascots "Huanhuan, Yingying and Nini" into the box. Xiao Cong takes any card from the box, and the probability of getting Nini's card is.
5. If the base angle of an isosceles triangle is 54, then its vertex angle is
6. Fold a circular piece of paper in half, so that the crease divides the circular area equally. Then there are several origami methods.
7. There is a square. If the side length x (cm) is the independent variable and the area y (cm2) is the dependent variable, the relationship is.
8.
As shown in the figure, AB = DC in △ABC and △DCB is known. If you don't add any letters and auxiliary lines, you need to add a condition to make △ ABC △ DCB.
Binocular selection (8×3 points =24 points)
15. A candle is 20㎝ long and burns 5㎝ per hour after being lit. The relationship between the residual height h (cm) during combustion and the combustion time t (hours) (0 ≦t≦ 4) is ().
A.h = 20-5tb.h = 4tc.h = 5td。 Can't be sure.
16.
The picture on the right shows the driving distance s(㎞) and driving time t(h) of someone riding a bicycle.
Function image of, the following statement is incorrect ()
A. Drive to 30㎞ from 0 to 3.
B keep moving at a constant speed from 1 to 2 o'clock.
C. From 1 to 2 o'clock, stay where you are.
The speed from d 0000 to 1 is the same as that from 0000 to 0300.
Three times careful calculation
17. Calculate -2A (A-B)+(A-B) 2 (5 points)
18. Clever calculation (there must be a calculation process, you can't use a calculator, choose one of the problems to solve)
(1) 20072 (5 points) (2)30 1×299(5 points)
Fourth, elaborate painting.
19. The picture shows an equilateral triangle. How many axes of symmetry does it have? Please draw them with a ruler. (3 points)
20. Please design a beautiful lace pattern with two basic patterns (4 points).
2 1 Known: Please make a right angle △ABC with a ruler for line segments B and ∠.
Make ∠ A = ∠ ACB = 90 AC = B (4 points).
22. Connection (6 points):
A. The flag raised in Ran Ran (the relationship between height and time)
B. A bowl of Lamian Noodles gets colder as it dries (the relationship between temperature and time).
C. shot put (relationship between height and time)
D. Aircraft flying at a constant speed (relationship between speed and time)