Well, who has the answer to page 46-60 of the second volume of the eighth grade mathematical optimization design?

1.2(2a+ 1)(2a- 1)2. 1 3.2 . 5× 10-6 4.8 5 . x≤6.0， 1 7。

2. Multiple choice questions (3 points for each question, * * * 24 points)

9.D 10。 C 1 1。 B 12。 D 13。 D 14。 A 15。 C 16。 C

3. Operation questions (5 points for each small question, 20 points for * * *)

17. solution: the original formula 1 min.

3 points

5 points

18. Solution: After removing the denominator, 3x+x+2 = 4,2 points.

Solution: x=, 3 points

X= is the solution of the original equation. Five points.

19. Solution formula =

Because, let x=0 and the original formula =- 1.

20 solution: because x =- 1, 1 min.

Y = = 7+4 = 2 points