Fill in the blanks

60 isosceles angles are equal and two straight lines are parallel.

The vertex angles are equal, 1 2 a b is equal, and the two lines are parallel.

35

50

140

80

Second, multiple choice questions

ABAAA

Third, the application problem.

The first question was omitted. There are too many processes to type.

2、∠DEF= 125

3、EGB=55，HGQ=35

There seems to be a typo in the fourth question. Can't find where ∠ 1∠2 is. .

Exercise 2

Fill in the blanks

The shape and area are parallel and equal.

5 7 72

6 4 8

BD DC BC

BAE CAE BAC

AFB AFC

Second, multiple choice questions

ABBD

Third, the application problem.

1, three, △ABD, △BCD, △ABC

2、5 1

(1)54 > BC > 30 (2)24 > BC > 6

4、∠ 1= 1 14，∠DBE=29

There is another mistake in the fifth question here. What does the last sentence mean "has the size changed?" So don't do this problem.

Exercise 3

Fill in the blanks

24

eighty-five

40

100 140

eight

12

Second, multiple choice questions

BDDBB

Third, the application problem.

1、∠ADC= 108

2、∠ACB= 1 10

3. The area of △ BEF = 3

4, 1 1 edge

The fifth question has many processes. . So it's abbreviated.

6. The first question is the same as above, and the second question is ∠ BAC+∠ BHE = 180.

Exercise 4

First, multiple choice questions

DCCCD

Second, the calculation problem

-x^3

- 1/64x^6y^ 12z^ 18

y^3

y^ 13

1.44× 10^ 18

-(x-y)^3

Third, the application problem.

1, 5× 10 12 operation.

2. After ten seconds, the volume is 8× 10 12.

3 、( 1)x=3 (2)x=3

4 、( 1)pq (2)p^2q^3

Exercise 5

First, multiple choice questions

BDBBC

Second, the calculation problem

a^6b^3

nine

- 1/x^3

-(b-a)^4

Third, the application problem.

1 is 50 times.

2、7/8

3、-(x+y)^6n+ 1

4、 1 1

5、( 1)x^2 (2)y=x^2+2

Exercise 6

First, multiple choice questions

CDBBC

Second, the calculation problem

-4a^3-6a^2+2a

x^4y^2-x^3y^2

2x^3- 1 1x^2- 18x

6x-x^3

a^2-4b^2+ 12b-9

Third, the application problem.

1、8

2、3xy^3-2

3、30

4、5a^2+ 13a+7

Use your head (1)-11(2) 3x-0.5

Exercise 7

First, multiple choice questions

ADCBB

Second, the calculation problem

- 1/9a^2+b^2

-5x^2- 12xy+ 10y^2

x^2-y^2+2yz-z^2

8 1x^4- 1

x^4- 16

Third, the application problem.

1、 1/ 10

2、x=6

This problem has not been solved. . Forget it.

4、a=-2 b=3

5、( 1) 1/5 (2)4 1/25

Use your head 2 4n- 1

Exercise 8

First, multiple choice questions

DACAAA

Second, the calculation problem

- 1 1x^2+3 1x-6

x^4- 1/ 16y^4

2x^4-2x^2y^2

Third, factorization.

3(x-y)(x-2y)

(4b-4c+a)(4b-4c-a)

(x+2)^2(x-2)^2

(a+b-3)^2

(a-2+b)(a-2-b)

(x+y+ 1/2)(x+y- 1/2)

Four. a= 1

Use your head -2/3