1.b This question examines the calculation of irrational numbers and the concept of square root. Among them, students are easy to make mistakes, so we should pay attention to the cultivation of the ability to examine questions.
2. This question examines the determination of the position and central symmetry of parallelogram.
3.c This question examines the understanding of the nature of isosceles trapezoid and the application of the basic graphic method. The three correct ones are A.B.D
4.a This question examines the nature of function images and should be explained by combining numbers and shapes.
5.d This question examines the image solution of binary linear equations, which embodies the relationship between binary linear equations and linear functions, and should run through the idea of combining numbers with shapes.
6.c This question examines the problem-solving skills of rotating transformation combined with constructing congruence.
Second, fill in the blanks
7.25 This topic examines Pythagorean theorem and formula deformation, which can appropriately penetrate the knowledge of factorization.
8. X>–2.7 This topic highlights the idea of combining numbers with shapes, and investigates the relationship between linear functions and inequalities.
9. 1 This topic examines translation transformation, parallelogram judgment and area calculation, equation thinking, observation and guessing ability.
Third, answer questions.
10.( 1)300 (2) 1060 (3) 15;
(4) reasonable. It is enough to estimate the population with samples. (Only "reasonable" can get 1)
This topic examines reading pictures, collecting data, calculating average values and using statistical ideas.
1 1. solution: (1) ... solution: ...
② ① At that time; When > 120, ...
(This topic examines the solution and application ability of equations and the comprehensive application of equations and functions.)
12. Solution: (1) The coordinates of the qualified point are D 1(0. - 1).
Let the analytical formula of the straight line be,
Get a solution from the meaning of the problem
The analytical formula of the straight line is.
(2)
13.( 1)∵CE is the bisector of ∠BCA, ∴ BCE = ∠ ECA, and ∵MN‖BC.
∴∠BCE=∠FEC,∴∠FEC=∠BCE ,∴OE=OC, the same OC=OF, so OE=OF…
(2) When the O motion is the midpoint of AC, the quadrilateral AECF is a rectangle. ..........
∫ce and cf are bisectors of the inner and outer angles of∣∠ ∣∠BCA, AO=OC, EO=OF,
∫∠ECF = 90, ∴∴ AECF is rectangular. .........
(3) When AC⊥BC,O is the midpoint of AC, AECF is a square. .........
This topic examines the preliminary conjecture, the ability to demonstrate, the judgment of special parallelogram, and the application of basic graphic method.
14.
Math Learning Plan 2 Reference Answer:
Give it a try
basic skill
1.D
2.B
3.
4.x & lt- 1 .
5. Answer: Solution: (1)y 1= yuan;
Y2= yuan.
(2) It was solved at that time.
When customers buy RMB, the cost of shopping in two supermarkets is the same;
At that time, the solution was there, but ...
That is, when customers spend more than RMB but less than RMB, it is more favorable to go to supermarket B;
At this time, Shed,
That is, when customers spend more than RMB, it is more favorable to go to supermarket A.
Improve training
6.A
7.C
8.3 or 3.
9. Solution: (1) Suppose you buy two kinds of goods, two kinds of goods.
According to the meaning of the question, you must
Simplify and acquire
Solve it and get it.
A: The mall bought 200 RMB and 120 RMB respectively.
(2) Due to the purchase of 400 items, the profit is (yuan).
Therefore, the profit from selling goods should not be less than (yuan).
If the price of each commodity is yuan, then.
Solve.
Therefore, the lowest price of this commodity is 1080 yuan/piece.
10. Answer: the solution of (1)x0 is x0, and the solution of x0 is xy B, that is,1.2x+900 >; 1.5x+540∴x<； 1200
If Y A =y B, it is1.2x+900 =1.5x+540 ∴ x =1200.
If Y A is x=2000 and Y A =3300 A: when 500≤x 1200 copies, it is more economical to choose a factory;
So it costs 3300 yuan to print 2000 admission notices and choose a factory.
Improve training
10.=2 or 311.d.
12. Suppose Terry scores X in this game, then Nash scores x+ 12.
Answer 22: Mavericks won, Terry scored 23 points and Nash scored 35 points.
13. Solution: Let the price of biscuits be X yuan per box and the price of milk be Y yuan per bag.
Then substitute x=9 into ④ to get y=9.2-0.9×9= 1. 1. A: A box of biscuits is priced in 9 yuan, and a bag of milk is priced at 1. 1 yuan.
14.( 1) ∵ If the section of A car is used, the section of B car is (40-).
(2) According to the meaning, it is ≥
If you solve it, you will get ≤≤≤≤
Integer, ∴ or. * * There are three schemes:
① There are 24 A-type vehicles and 6 B-type vehicles/KLOC-0;
(2) There are 25 Type A vehicles, and Type B vehicles 15 vehicles;
③ There are 26 A-type vehicles and 4 B-type vehicles/KLOC-0.
(3) At that time, 1 ten thousand yuan; Ten thousand dollars at that time;
Ten thousand dollars at that time;
Therefore, Scheme 3, that is, 26 A-type vehicles and 14 B-type vehicles, is the most economical, and the most economical cost is 268,000 yuan.
The first answer to the second grade English study plan
I. BDAAD, CCAAB, BABAD, CACDC, ADBCC, CCAAC
Two. ADCBA ABDCD
Three. CADDD、FFTFT
Four. 1. Astronaut 2. Architecture 3. Pet 4. Fail 5. loudly
6. Pollution. Subtract 8. There are nine missing. Boring 10. style
Verb (abbreviation of verb) 1 .sales 2. Script 3. Prediction 4. Teaching 5. take
6. Go to study 7. Laugh 8. Swimming. Planning 10. incision
1 1. Not 12. Can work 13. Fly 14. Skating 15. myself
The intransitive verb 1. can't learn 2. Will there be? Any three. Where will it be 4? How soon?
5. Have time. What is 7? Unexpanded 8. Not lost
9. I spent, 10. No, it should be 1 1. What's the matter 12. Will play
13. No 14. What will you do?
Seven. 1. In the future. Hundreds of years 3. Because, you will meet a lot.
4. Play, loudly 5. It's out of date Talk, on the phone
7. Enough food. Left, at school 9. on the other hand
10. Never ask, ask 1 1. You should not argue with 12. Call me
13. Can fly, to 14. Yes, it will be like in 15. Which team will win the World Cup?
16. Agree 17. Health 18. It seems that waiting.
19. Hopefully, it will come true, in the next 20 years. It's impossible for me
Eight. 1. D in two days. D the funniest 3. B is 4. C is more than 5. write
6.c sings 7. Borrow 8. D except for nine. D suggestion 10. C a lot
1 1.c surprise 12. D payment 13. D is 14. On 15. B yes
Nine. A. 1。 Please don't enter. Looking for 3. Paid 4. Found five. Neglect; leave out
Step 6 be comfortable. Loud advice. Original 10. important
B. 1. needs 2. I have learned it. I'm working on it.
I will make progress. You know, 7 help
Second grade English learning plan 2 reference answer
Unit3 through train answer:
I. 1. Flight number two. Hero 3. I was reading a book and came at 4 o'clock. Jump, move
5. Cooking and washing clothes. There are seven. Ride 8. Looking for
9. Walking 10. Silence 1 1. Arrival 12. Can't do 13. Read and listen.
14. Used to be, lying 15. Watching 16. Yes, sleep, come on 17. Cooking and washing clothes
18. Driving, it's raining 19. Will be 20. be shopping
Two. 1—5:BCAAC 6- 10:DBBAB 1 1- 15:ADACC 16-20:BBAAC 2 1-25:CBDCD
Three. 1. Don't do 2. I didn't leave until 3 o'clock. And, watching 4. The best basketball player. Isn't he six years old? What were you doing when you were 7 years old? isn't it?
Four. 1. One of the best teachers. Muder happened at 3. When, listening to 4. leave
5. Have an unusual experience
Verb (abbreviation for verb) ends, yes, walking, hearing, following, yes, starting, saying, yes, coming.
B. 1. Learning 2. Between three. It's like four. Believe in 5. Earth 6. Page 7. Maybe eight. Balloon 9. Yes 10. answer
Intransitive verb1-5: CBD ad 6-10: aabcb
Seven. 1 - 5: BDABD
Reference answer for the fourth lesson of Grade Two Mathematics:
Give it a try
Basic exercises
1.()
2. Factorize the following polynomials:
( 1) (2) (3)
(4) (5 )
3. (short answer)
4. answer: yes, bn+bm+am+an=(a+b)(m+n)
5. Answer: A2-4b2 = (a+2b) (a-2b) = (13.2+2× 3.4) (13.2-2× 3.4) = 20× 6.4 =128.
6.( 1) Answer: x3y-2x2y2+xy3 = xy (x-y) 2 = 2×12 = 2.
(2) answer: simplify a(a- 1)-(a2-b)= 1 and get b-a= 1.
==
7.( 1);
(2).
(3)
Improve practice
8. (n+11) 2-N2 =11(2n+11), which is proof.
9. Answer: 4x, -4x,
10. A: When x=- 1, the minimum value can be taken, and the minimum value is 1.
1 1. Answer:
So x=-2, y=5, so =xy(x+y)=- 10×3=-30.
12. Answer: The square difference between two consecutive odd numbers is a multiple of 8.
Let two consecutive odd numbers be (2k+ 1) and (2k- 1) respectively, then
(2k+ 1)2-(2k- 1)2 =[(2k+ 1)+(2k- 1)][(2k+ 1)-(2k- 1)]= 8k
Junior two English learning plan 3 Answer:
First, choose to fill in the blanks.
1-5 CDAAD 6- 10 ABDCA 1 1 ~ 15 BBBBB 16 ~ 20 AABAA
Fill in the blanks with the proper forms of the given words.
1. First 2. Suppose it is 3. Health 4. Lucky five. worse
6. I chose 7. Asians. Speaker 9. Transcript 10. replica
Cloze test
1~5 BBCDC 6~ 10
Fourth, reading comprehension.
1-5 DDACB
1. Teach young members everything they know.
2. Invented letters and learned to write.
3. Professional work
4. Egypt, and maybe China five or six thousand years ago.
5. The rights of every child
Verb (abbreviation for verb) Choose words to fill in the blanks.
Useful, life, more, out, in, family, for, improve, use, complain, behind, others, oneself.
Complete the sentence:
Although, I am very bad.
Take me, reply
First, thin, feel sick.
It's really hard
In fact, there is almost no difference.
Open, start
Physical Buoyancy of Senior Two (2) Answer
Consolidation exercise (1)
1.A 2。 C 3。 Constant, bigger 4. Equal to, equal to 5. C6。 D7。 C8。 B9。 D 10。 D.
Consolidation exercise (2)
1.9×103kg/m3 2.a3. After decreasing, it remains unchanged, which is 4.9V/4 5.3/4, which is equal to 6.2 ∶ 37.4 ∶ 38.c
Consolidation exercise (3)
1 . 7 . 4 N2 . 1 . 5× 103kg/m3 3。 D4.F floating =8N, v = 8×10-4kg/m3 ρ =1.25× 65438+. ρ = 2.0× 103kg/m3 6.8: 9 7。 (1) 2.00, 2.50, 2.50 (2) Omitted (3) The buoyancy of a cylindrical object before immersion in liquid is directly proportional to the depth of immersion in liquid; After the liquid surface is submerged, the buoyancy remains unchanged. 8.( 1) 300 N, (2)100n.9. (1) 0.35kg (2) 2×10-4kg/m3 (3) polyvinylidene fluoride.
Consolidation exercise (4)
1.( 1) Depth (2) B, d or c, d 2. D 3。 (1) Measure the side length a of the wood block with a scale, (2) float the wood block on the water, and measure the immersion depth h of the wood block in the water, (3) the wood block density ρ=hρ water. (2) Let the wood block float on the surface of salt water, and measure the depth H2 of the wood block immersed in salt water, (3) ρ salt water =h 1ρ water /h2 5. (1) Tie the stone with a thin thread and hang it under a spring dynamometer to measure the gravity g; (2) Immerse the stone in water and read the tension f at this time. (3) stone density ρ stone =Gρ water /(G-F) 6. (1) Tie the stone with a thin thread and hang it under a spring dynamometer to measure the gravity g; (2) Immerse the stone in water to read the pulling force F 1; (3) Immerse the stone in salt water to read the pulling force F2; (4) Saline water density ρ saline water.
7.( 1) Equipment: spring dynamometer, teacup, water, rope and stone. Experimental steps: ① Tie the stone with a thin thread and hang it under a spring dynamometer to measure the gravity G; (2) Immerse the stone in water to read the tensile force f1; (3) Immerse the stone in milk and read the pulling force F2; ④ Milk density ρ milk = (g-F2). Take as big stones as possible, take them out of the water, dry them and put them in the milk. 8. Steps: (1) Inject a proper amount of water into the measuring cylinder, and read the volume of water (V 1); (2) float the small wine glass on the water surface in the measuring cylinder, and read the volume value V2; (3) immerse the small wine glass in the water.
I attach English and science to you ~
But maybe I bought something different from yours. If not, LZ really needs to find another way. After all, there is no online ~
LZ can issue questions, and I'll do it now.