20 10~20 1 1 ninth grade examination paper in the second semester of the school year (2)

Mathematical reference answer

First, multiple-choice questions:

D

A

barium

B

C

Fill in the blanks: 4.lOxl0-5:

3√5; :80 :

y=3/4(x-2)2— 1:

Separation:

32500:

3:

√7:

The answer is not unique, just O.

four

17)(5 points) solution: the original formula =3.

18

19 b

20

120

80%

2500

2 1

6.7

seven

22

3/2

23

b=-2

c=8

nine

-4 & lt； x & lt2

24 1/2

257/2

three

106

26

(to) equal to ...

find

27

2

12

S=-t？ +8t-4

3/4 or 4- root number 3

28

four

y = x/2+ 1(0 & lt； x & lt6)

P is on the circle o