One-person teaching version of the eighth grade mathematics summer homework answer.

(1) Basic concepts: 1, discrete, 2, extreme value range, 3, value, minimum value, 4, large, small and consistent,

Homework: 1, 4973850, 2, 32, 3, -8, 4, -2 or 8, 5, 4, 6, d, 7, d, 8, 3040, 9, 13, 10.

(2)

1, knowledge review (1) average A: 40.0 B: 40.0 range A.4B:0.4(2) is not two, basic concept, slightly three,

Example analysis: variance, A:0.0 12B:0.034 standard deviation, slightly a relatively stable four,

Homework: (1) B (2) B (3) C (4) 8 (5) 200, 10 (6) 100 (7) Variance: A 0.84 B 0.6 1, so B is more.

(3)

1、 12; 2、①,②,③; 3、2; 4、; 5、2,; 6、 100; 7.b； 8.b； 9、4、3; 10、0; 1 1、C； 12、C； 13、C； 14、D； 15、B； 16、A； 17、B； 18、C； 19、C； 20、C； 2 1, (1)A: range 8, mean 99, variance 6.6; B: the interval is 9, the average value is 100, and the variance is 9; (2) A; 22. (1) The passing rate of group A is 0.3, while that of group B is 0.5, and the passing rate of group B is high; (2) The variance of group A is 1 and that of group B is 1.8, so the score of group A is relatively stable; 23. (1) The excellent rate of Class A is 60%, and that of Class B is 40%; (2) The median of class A is 100, and the median of class B is 97; (3) Class A variance is small; (4) According to the above three conditions, the champion certificate should be issued to Class A. ..

(4)

First, the multiple-choice question (this topic is entitled * * 10, with 3 points for each question and 30 points for * * *) is entitled 123456789 10 to answer CBAABDCCBD.

Second, fill in the blanks (this big title is ***8 small questions, with 4 points for each question, and 32 points for * *)11.212.14.6+05.50001.000000000605

Two-person education version of the eighth grade mathematics summer homework answer.

(a) the answer:

1-8、DABDDDCA9、 1,2,3; 10、a≤b； 1 1、a- 1； 13、7;

14 、( 1)x & lt； 2，(2)x & lt； -3; 15、a≤; 16、 1; 17,18cm; 18、2 1

2 1 and 18 questions; 22, (1)a=0.6, b = 0.4(2)35% to 50% (excluding 35% to 50%).

(2) Answer:

1:D2:A3:A4::A5:C6:C

7:-28: 1, 9: x = 2, 10: x. ≥ 0 and x ≠ 1,1,omitted, 12, omitted. 17, c, 18, 2, 19,-1, 20, k = 1, 4, 7, 2 1, reciprocal, 22, 47.

(3) the answer

1，- 12，y = 2/x3，B4，D5，B6，C7，B8， 1/29，2 ∏ 10，B 1 1，(65438。

(4) the answer

1、B； 2、B； 3、B； 4、A； 5、B； 6、B； 7、D； 8、D； 9、≠5; =— 1; 10、t≤— 1； 1 1、—6; 12, decrease; 13、a—3； 14, 3 and 4; 15、 19; 16, 3 or 4/3; 17、x≥ 1； 18、x & lt 1; 19, x-3, original formula =-; 20, omitted; 2 1、x = 4； 22、y=-x+2，6； 23, omitted, BD=6

(5) the answer

1.4:32.63.38584. 185. 1:96. 187.①④8.∠A=∠D

9.(-2，-3) 10.2 1 1 . b 12 . d 13 . c 14 . a 15 . a 16 . c 65438。

19. Omit 20.5.22 1. Or 22.523.6.4

(6) the answer

1-8:CCCBBABC9: 1.6，26； 10:8.75; 1 1:∠A=∠A，∠AFE=∠B，∠AEF=∠C，

12:7; 13:6.4; 14:8:5; 15:48; 16:6,4.8,8.64;

17:9:4; 18: 1:3; 19:420: 13,; 2 1:8.3

(7) the answer

1，C2，A3，D4，C5，B6，B7，B8，D9。 If the two angles in a triangle are equal, then this triangle is a right triangle. 10,7511,70 12, abbreviated 13, two triangles with two sides and an angle corresponding to each other, these two triangles are congruent 14, abbreviated/kloc-0.

(8) Answer

1.D2 a3 . D4 . b5 . D6 . b 7 . 1/68. 1/209. 1/3 10.0 . 4 1 1. 1/6 12. 1/2

13.( 1) k of hearts, k of spades, k of diamonds and k of clubs (2)1/52 (3)13 (4)1/4 (5

14.( 1)7, 14, 2 1, 28, 35, 42, 49, 56, 63, 70, 77, 84, 9 1, 98 * * 658.

Three-person teaching version of mathematics eighth grade summer homework answer

( 1)

1.B2.B3.D4.B5.C6.C7.408 parallel 9.a = c>b.

10.13611.The offset angles are equal and the two lines are parallel; 3; 4; Two straight lines are parallel, and the same angle is 12. (1) omitted.

(2) Parallel, the reason is slightly 13. Omit 14. ( 1)∠b+∠D =∠E(2)∠E+∠G =∠b+∞。

(2)

1.C2 B3. D4. D5. D6. c 7.50 or 65.8.49. parallel

10.9 cm or 13 cm11.6012.13, omit 14, omit 15.

16. (1)15 (2) 20 (3) (4) Yes, the reason is omitted.

(3)

1.20 2 . cm 3.84 . 4.85 . 366.37 . D8 . c

9.B 10。 B 1 1。 Omit 12. FG bisects DE vertically, the reason is slightly13.0.5m 14. The reason is omitted 15. ( 1

(4)

1.C2 d 3 . B4 . a5 . C6 . a7 . c8 . b 9.30 10.6

1 1., 12. Omitted 13. Omit 14. (1) Regular hexagonal prism (2)6ab 15.36

16.cm

(5)

1.D2.D3.B4.D5.( 1) Sampling survey (2) Census 6.8.07. 17.

8.50.49.3 1; 3110.171.The champion, runner-up and third runner-up are Li Yang, Lin Fei and Li Cheng respectively.

12. Omit 13. leave out

(6)

1.B2 C3 . c 4.50； 105.0. 1576m 26。 ①②③7.

8. Omit 9. leave out

(7)

1 . B2 . a3 . C4 . a5 . C6 . B7 . D8 .( 1)

(3)≥(4)& lt； (5)& lt； 9.4 10

14.-2，- 1 15. 16 . b & lt； 0

(8)

1.D2 C3 . C4 . C5 . n≤76.238。

9.0 ≤ y ≤ 510.11.x3 (3) has no solution.

13. 1,2 14.34, 16 15.( 1)9≤m & lt； 12(2)9

(9)

1 . C2 . B3 . C4 . 18≤t≤225 . 4 . 0m/s 6.5，7，9

More than 78.2 thousand yuan, 9.22 10.4 people, 13 bottles.

1 1. When the number of tourists is 10 ~ 15, choose travel agency B; When the number of tourists is 16, both travel agencies can choose; When the number of tourists 17 ~ 25, choose travel agency 12. (1)35 yuan and 26 yuan (2) have three schemes; The plan to buy 23 cultural shirts and 27 photo albums is sufficient for buying teachers' souvenirs.

( 10)

1.C2。 C3. C4. C5. D6. C7 is any real number; It's 08.a

9.40 The distance from south to west is 80m 10. (6,6), (-6,6), (-6,6), (6,6)11.5 or-1.

12.(5,2) 13.(x，6)(-3≤x≤2) 14。 Omit 15. (-2,0) or (6,0)16.