Publisher: Liu Yongxiu

fill (up) a vacancy

1,-1/3x-x2y+2n is _ _ _ _ _ _, the coefficient of the second term is _ _ _ _ _ _, and the number of times of the third term is _ _ _ _ _ _.

2. As shown in the figure, the parts of two rectangles overlap, the overlapping part is a square with a side length of 2, and the area of the shaded part is _ _ _ _ _ _ _ _ _.

c

d

b

a

3. When you toss two coins at random, the probability of at least one coin facing up is _ _ _ _ _ _ _ _.

4. As shown in the figure, if ∠ 1+∠ 2 = 280, ∠1= _ _ _ _ _ _, ∠ 2 = _ _ _ _, ∠ 3 = _.

5. According to the data of the fifth population census in China, the total population of China is1295,330,000, the accuracy is _ _ _ _ (expressed by scientific counting method), and the effective figure is _ _ _ _ _ _ _ _.

6. As shown in the figure, (1) If ∠ 1+∠ 2 = 180, ∠ 1 = ∠ 3, find out the parallel straight lines in the figure and explain the reasons _ _ _ _.

(2) If e‖m, b‖c, find out the relationship between the corners in the diagram and explain the reasons _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

British Airways

C 1 m

3 4

2

7. Xiaoming has two sticks 4 cm and 9 cm long. If you want to make the third stick into a triangle, the value of the third stick should be in the range of _ _ _ _ _ _ _ _ _ _.

8, according to the following inherent laws, fill in the appropriate graphics on the horizontal line:

9. As shown in the figure, the numbers in the mirror are shown in the figure. The number on the actual paper is _ _ _ _ _ _ _ _ _ _ _.

80 1

10, the base angle of an isosceles triangle is 40, so the top angle of this isosceles triangle is _ _ _ _ _ _ _ _.

Second, choose

1, 2.4695 accurate to thousands is ()

a、2.469 B、2.460 C、2.47 D、2.470

2. If the top inner angle of a triangle is equal to the sum of the other two inner angles, then this triangle is ().

A, acute triangle B, right triangle C, obtuse triangle D, and above are all possible.

3. Which of the following groups of numbers can constitute the Pythagorean number ()

a、3、4、7 B、2、4、5 C、5、 12、 13 D、6、8、 12

4. A square is an axisymmetric figure with an axis of symmetry of ().

a、2 B、3 C、4 D、5

5, the following calculation is correct ()

a、a3×a2=a6 B 、( 3ab2)2=6a2b4 C、y5÷y5= 1 D、y5+y5=2y 10

6. A candle is 20 cm long and burns 5 cm per hour after lighting. The relationship between the residual height n (cm) and the burning time t (h) is expressed as ().

A.

20 hours (cm) 20 hours (cm) 20 hours (cm) 20 hours (cm)

0 4 tons (hour) 0 4 tons (hour) 0 4 tons (hour) 0 4 tons (hour)

7. In the two triangles shown in the figure, ∠ 1 = ∠ 2, AB = DE. If △ ABC △ EDF, another condition is ().

Christian era

C

British Institute of Engineering

a、∠B=∠F B、BC=EF C、∠B=∠D D、AC=DF

Third, calculation

1 、[(3a+b)2-b2]÷a 2、 105÷ 10- 1× 100

3 、( 2/5mn 3-m2 N2+ 1/6n 4)÷(2/3n 2)4、 1007×993

5 、( 2x-5)(2x+5)-(2x+ 1)(2x-3)

4. Design two turntables and play the game of matching purple, so that the probability of winning is 1/3, which is represented by a tree diagram.

5. As shown in the figure, a flagpole breaks 9 meters from the ground, and the top of the flagpole is 12 meters from the bottom of the flagpole. How high was the flagpole before it broke?

6. Xiaoming made a kite as shown in the figure, in which ∠ EDH = ∠ FDH, ED = FD, and Xiaoming knew Eh = FH without measuring. Why? Explain why.

D

English and French

H

Xiao Li and Xiao Ming are discussing this problem:

Xiaoli: If 7498 is rounded to four digits, it is 7000.

Xiao Ming: No, I have another solution. I can get different answers. First approximate 7498 to a hundred, and you get 7500. Then about 7500 to several thousand, you get 8000.

What do you think of Xiaoli and Xiaoming's statement?