I. Translation, Rotation and Axisymmetry

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1 page? I. 1. Right 5 2. Down 4

Page three? I. 1.6: 00 180 2.4

3.( 1)D (2)D (3) forward (4) reverse.

4.( 1) 90 (2) 90 (3) 90 (4) 90.

Page 4? Two. 1.× 2.√ 3.× 4.× 5.×

Extended application

Page two? (1) Omit (2)55

Page five? 9?o'clock

Unit exercise

1. 1. Rectangular, square, isosceles triangle, isosceles trapezoid 2. 90+080 3.4.

4. Right 8 down 4 (or down 4 right 8) 5. ( 1) C (2) C。

Second, 1. C 2。 ABC C3。 B

Third, ellipsis

Fourth, ellipsis

Second, know multiple digits.

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Page 8? 1. 1.44 million, 200 million.

3360000 2080000 2366090 42000000203,000

Two. 1.× 2.√ 3.√ 4.×

Page 9? 1.1.10000 500000 2.600002.600003.56000001

5.203404002034040302050302050

Second, 1. B 2。 C 3。 A 4。 B

Page 10? Two. 8000000000 1050000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

3940 billion 384 billion 1000 billion

Page 1 1? One,1.3500500002.100001

3.30003000000000033.3 million 4.365438+250 million 240 million 2 4000

Twenty, nine billion, nine billion, nine billion, nine hundred billion.

Page 12? 1. 1.65438+ 1 90000009002450904509 3150541400,000.

Page 13? Two. 1.√ 2.√ 3.× 4.×

Page 14? Three. 602,200,800,450,402,000,000.

Four. 655.7 million yuan

552.04 billion

Extended application

Page 8? three

Page 9? 470 128

Page 10? 1.100000000 2.60000 3. Omit.

Page 1 1? 99999999999 and 100000 1

Page 12? 84384384

Page 13? 75000, 76000, 77000, 78000, 79000, 8 1000, 82000, 83000 or 84000.

Page 14? 204999 195000

Unit exercise

1.110 billion 22499999915000003.11008 billion.

56,456,456,53,000 65,438+69,800,407.40077888886

8.> < = < 9.

Two. 1.× 2.× 3.√ 4.√ 5.×

Three. 1.A 2。 C 3。 C 4 explosive A 5。 B

Four. 1.7026400 1 104200002.200000

Five, 4.09 trillion 28 billion

Intransitive verb 48365438+ 1, 3 1.4 million

Seven. 365,438+39 billion

1.87400 2.788 3 (the answer is not unique) 4. 3467800 (the answer is not unique)

Three, three digits multiplied by two digits

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Page 17? Two. 1.7824 Yuan 2.3740 7252 2685 2 1672

Page 18 ~ 19? Two. 120 yuan/box 240m/sec 450m/min 200t/month 54 PCs/day.

50 kg/bag 32 PCs/person

6. 1.2952 square kilometers. 4 books are 3.64km/h 4. 56 yuan/Taiwan.

Page 20 ~ 2 1? 2.1.(1) 432m (2)5 days (3) 36m/day.

2.58 yuan/only 3. 1375 RMB 4. 1 1970.

Page 22? 1. Several times the original product of 1. 5 8 2.200 400 200 800 3.480 4800 1080 10800 120 280

Page 23? 2. 1.7500.2. Number

Page 25? 3.1.3000g, 3kg, 2. 16800 yuan, 4800 yuan, 3. 11200m2, 440m, 4. 2 160 pieces, 5. 7200 kwh.

Extended application

Page 17? The answer to this question is not unique. For example: ① We should buy more fairy tale books next month, because these books sell the most; We should buy more story books next month, because the total selling price of such books is the highest.

Page 19? tiger

2 1 page? B branch

Page 22? (1) 50m/min (2) 32min

Page 23? The answer is not unique. Such as: 24× 50 = 1200, 28× 100 = 2800.

Page 25? 225 people

Unit exercise

I. 1.452.3.4. (1) 20: 00150m/min12500m (2)600 45 8

5.450 1350 1800 18000 45000

Two. 1.8000 2800 2 1000 8600 35000 840 3000 1200 8400

2.30480 9500 37800

3.7000 9000 4000 1300 4000 6000

Third, 1. Not enough 2. (1)360 yuan 336 yuan 342 yuan (2)750 yuan

3.82×530=43460 20×358=7 160

Fourth, use a calculator to calculate.

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Page 28? 2.58 13572 7864 150 298 0 758 1 1370 1805

Page 29? 1. 1. 1. 1.2 1. 1. 1.023432 1. 1. 1.234532 1

2. 100 1000 10000 1 1 1 16+9876×9= 100000 1 1 1 1 15+98765×9= 1000000

Page 30? I.1.13568 3681.409 4104108 2624410812852 338

2.240 4 1548 20 165

3.946 946 468 1 468 1 a-(b+ c)

Page 32? Second, 1. 40 400 4000 40000 400000 400000 4000000

4000000× 13 = 52000000 (g) 52000000 ÷ 500 = 104000 (day) 104000 ÷365≈285 (year).

2. 10000 meters One hundred million such papers are stacked together, and the height is 1 156 meters.

3. 1 157 days and 3 years

Extended application

Page 28? 20055

Page 29? If the selected number is A, then the final result is aaaaaa.

3 1 page? 1

Unit exercise

I.1.2076 2.5438+00

Two. 1.8 150560 3600 5 100 300 100 96 12

2.9000 857 142 500 28690000 3 14 0 468 205 52320 1 17000

3.( 1) 100 1 2002 3003 4004 5 6 7 7007 143 8008

143×9×7=9009

(2) 1090 2090 3090 5 5090

6+676×9=6090 7+787×9=7090 8+898×9=8090

Three. 1. 16 days. 2. There are three. 228,200 430 yuan, around 230,000, and 4. 90 points.

5.( 1) 6570kg (2)263 barrels (3)65 pieces (4) Save water and cherish water resources.

Verb (abbreviation of verb) strategy for solving problems

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Page 37? 2. 1. Large number: 86 decimal number: 34 2. 40 cm 60 cm 3.55 m/min

Page 38? Second, 276 square meters

Extended application

Page 37? 19632

Unit exercise

I.1.48 34 75 9616171516

2.300 420 300 420

2. 1 .pear 3 10 kg apple 530 kg 2. 480 square meters

3. The maximum is 100 square meter, and the minimum is 49 square meters. 4. Xiaoxiang 52 Xiaoli 26.

Three, 1. The long rope is 55 meters and the short rope is 45 meters 2. 600 square centimeters. 3240 trees 4. 626 people.

Six, operation method

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4 1 page? I. 1. A+B = B+A (A+B)+C = A+(B+C)

2.73 92+(49+5 1) 62 75 122 55 59 46 77 48 32

3.46 A 18 F D E

Page 42? Third, 669 people.

Page 43? 1. 1.A× B = B× A (A× B )× C = A× (B× C)

2. Omit 3. 660 2800 1000

Page 44? Three. 1. 12000 yuan, 2500 yuan.

Page 45? Two. 1.√ 2.× 3.√ 4.×

Three. 1.B 2。 B 3。 B 4。 C

Page 48? Ii.1.7800120361001942221094643840106028

2.900 577 64 600 2340 990

Page 49? Two. 1.√ 2.× 3.√ 4.√

Page 5 1? Second, 1. A 2。 C

Page 54? Three, 1. (1) enough (2)60 yuan (3) slightly 2. (1)1540m (2) 350m.

Extended application

4 1 page? ○+□+△=○+(□+△)

Page 42? ( 104+96)+(97+ 103)+( 105+95)=600

Page 43? 125× 16×5=( 125×8)×(2×5)= 1000× 10= 10000

Page 44? leave out

Page 47? 30 ml

Page 48? leave out

Page 50? 2 12

Page 52? 36×56+72×22 99×98+ 198

=36×56+36×2×22 =99×98+99×2

=36×(56+2×22) =99×(98+2)

=36× 100 =99× 100

=3600 =9900

Page 54? 99×99+ 199 999×999+ 1999

=99×99+99+ 100 =999×999+999+ 1000

=99×(99+ 1)+ 100 =999×(999+ 1)+ 1000

=99× 100+ 100 = 1000×999+ 1000

= 100×(99+ 1) = 1000×(999+ 1)

= 10000 = 1000000

Unit exercise

I. 1. (1) Multiplication exchange A× B = B× A (2) Addition combination (A+B)+C = A+(B+C)

(3) the multiplicative distribution (a+b) × c = a× c+b× c.

2. Omit 3. Omit 4. > = < = 5.24000

Two. 1.× 2.× 3.√ 4.√ 5.×

Three. 1.C2.A3.C4.A5.B。

Four. 1.600 200 520 8 1 2 1 96 2800 10000 960 80 100 400.

2. Omit 3.3618 29701350 7000 7128 2300 600 8500 2700.

Five, 1. 80 2. Enough for 3.480km12km 46,000 people.

5.( 1) No meeting 100m (2) Meeting 440m.

Seven, triangle, parallelogram and trapezoid

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Page 58? 1. 1. It is surrounded by 3 3 3 symbols connected end to end.

2.5 3. Draw vertices to edges and bottoms.

Page 59? Two. Introduction to the article 1. 12cm 2. three

Page 60? ( 1) 60 (2) 15

6 1 page? I./kloc-0 1.C2.A3.A4.A5.A6.A

Page 63? I. 1. 234535.

2.( 1) 90 right angle (2) 120 equilateral (3) 40 100 70.

Page 65? 1. 1.60 sharp 2. Straight plate 3.64 4.30

Second, 1. B 2。 B

Page 66? 1. 1. Parallelism and equality 2. Unstable retractable door 3. 26 26

Second,/kloc-0 1.C2.B3.A4.C

Page 67? Second, 1. A 2。 B

Page 69? Second, 1. B 2。 C

Extended application

Page 58? leave out

Page 59? 2 cm, 5 cm, 5 cm; 3 cm, 4 cm, 5 cm; 4 cm, 4 cm, 4 cm

Page 60? 1. Sketch 30,902.180× 2 = 360.

Page 62? 1 1 1 5 5

Page 64? 120 obtuse triangle

Page 66? 1. The parallelogram is unstable and can automatically expand and contract. 2. 16

Page 68? There are countless kinds, abbreviated.

Unit exercise

I. 1. Stability 2. 2, 3, 3, 2, 4. Exactly the same 5. 25

Two. 1.× 2.√ 3.√ 4.× 5.√

Three. 1.C2.C3.C4.B。

Fourth, ellipsis

Verb (abbreviation of verb)1.(1) 516m2 (2)156m2.12cm, 4cm.

Eight, determine the position

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Page 72? 1.(1) (2,2) (6,6) (2) Abbreviations (3,5) (3) 4 3 Abbreviations

Page 73? 1.(1) (3,3) (2,1) (5,0) (2) parallelogram for short.

Page 74? 2.( 1)( 1, 1) (3, 1) (3,5) (2)(7, 1) (9, 1) (9,5) (3,3) (3, 1) (7, 1)

Extended application

Page 72? (4,4) (5,3) (3,3)

Page 73? leave out

Page 74? Hangzhou

Unit exercise

I. 1. Line 2. (3,4) (3,5) 3.(5,5) (7,5) 4.2 1.95.54

Two. 1.× 2.× 3.√

Three. 1.B 2。 A 3。 B

Iv. (1) Omission

(2)(4, 1) ( 1,2) (5,2) (4,3) ( 1,4) (5,4)

(3) One (1) Two (4) Four (1) Five (4)

(4)(2,3),(3,3),(4,3),(5,3)

Verb (abbreviation of verb) 1.( 1) squared 2. (2)( 10，j) (8，h) ( 10，f) ( 12，h) 2。 Omit.

3. An isosceles right triangle can be (5,2) or (1 6) or (9,6).

Nine, finishing and reviewing

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Page 78? Two. 1.(1) Class IV (1): 16 10 yuan Class IV (2): 1680 yuan Class IV (3): 1664 yuan.

(2)4380 yuan

2. Draw the sketch as1350m2.

Page 79? 2. 1.90 yuan, 2. 65 square meters 3. 35 tons

Page 80? Second, 1. 2.？ 3.？

8 1 ~ 83 pages? I. 1. 90 2. Half 3. 63: 00 sharp, 4: 00. 70 100 5. Square 6. forty-four

7. 130 50 130 8.( 1)6 (2)4 (3)5

Ii. 1.a2.a3.bc4.c

Three. 1.√ 2.× 3.× 4.× 5.√ 6.√

V 1. 15cm 12cm 2。

Page 84? Two. 1.× 2.√ 3.×

Extended application

Page 79? 99 points

Final inspection

I. 1. Omit 2. Omit 3. 180 54000 60 4.80 65 5. Add and subtract 6. seven

7. Coincidence axis symmetry 2

Two. 1.× 2.× 3.√ 4.× 5.× 6.×

Three. 1.C 2。 B 3。 C 4 explosive B

Four. 1.4 720 780 450 100 8 1000 9 4200 1 1064

2.3888 8280 16 3.2000 3 62 10 4554 5700 4800

Verb (abbreviation for verb) negligence

6. 1.3 2.302 trees 3. (1) 330m (2) 600m 4.160m2 5.70m 6.350m.

7.1750m (2) 600m