Six answers to page 57 of the math class workbook.

Frost belt Jin Hong East Street Tiger words.

Give me one.

12，c:8，d:6，e:4，f:3

2①.Untie; Daddy should stand x meters away from the fulcrum to maintain balance.

35x*2=70

x=1②42*2=84(kg)

84 35 = m)

3.First find a small stone and put it under the iron bar, then put the big stone on top of the iron rod, the small stone is meters away from the big stone, and finally press the other end of the iron rod hard, and you can do it. You can draw that picture yourself, because I can't get it right.

: 5 24/5

4. Positive and negative failures.

7、 9x= 6/1x=2/1x4/1

x= x= x=8/1

x=8 x= x=4/3

{(10-4) 10} {10-2) 10}*10=I hope you can I'm very lucky.

Ahem, I'll tell you.

25 to 5 5 out of 24

1 to 3 1 to 9

4 to 3 4 to 3 3 to 4

Positive and negative. 3 to 4

4 out of 3

What about the topic, forget it, let me tell you evenly, lest you say that you are stingy.

10-2=8km

10-4=6km

A: C is still far from the finish line.

I'll tell you the eighth question.

10-2=8km

10-4=6km

A: C is still far from the finish line.

3 60 5=12 (times) 12 5 2=30 (km) 4 1-1 3-1 4=5 12 45 180=1 4 180x5 12=75 (page) 180x1 3=60 (page) 60:45:75=4:

3:55 3 1 4 = 12 (L) 3 + 12x1 6 = 5 (L) 12-5 = 7 (L).

581 (1) Mountains: Plains: Rivers and lakes: (2) Omitted.

3 Pass 25 Excellent 30 16 2 40

I forgot to bring my homework book, and I will definitely bring it after the exam in the afternoon!

1) 400-100 multiplied by 2 equals 200 meters and 200 divided by about 64 meters.

2) 100 times 64 + divided by 2) squared =

3) 64+ (m.

I'm sorry, I'll correct the following one, it's a miscalculation. 100 times 64 + divided by 2) squared = square meters.

1 2a+8

3 m-2 m+2 3m

4 Chairs** of a table and a chair** 3m=8m-1360

5 1 2 3 x/3-x/4=

x/12=x=35 x~ x=6

6 Solution: Suppose my mother's phone bill last month was X yuan.

2x+10=250

2x=250-10

x=120A: Mom's last month's phone bill was 120 yuan.

7 You have answered correctly.

1) Acute angles (2

90, right angle, isosceles (5

Rectangles, parallelograms, isosceles triangles (6

8> 4 5 8 < 9> 4 5 9 (8) with one.

90 ° angle and one.

45° angles put together.

P5: (3) Cylindrical side area = square centimeters.

Label paper area = 785-1 10 = 775 square centimeters.

4) A circular and column-shaped wooden pier, the circumference of the bottom surface, the height is 3dm, and the surface area is found.

Base Radius: Base Area:

Side area: surface area: square decimeters).

P9: (3) Each section is long, so it is sawn into 2 sections.

The surface area has been increased by 2 cross-sections.

Base area: square centimeters.

Volume: Vertical Zen Attack Square Centimeter.

4) Rotate on its length axis to obtain a cylinder with a base radius of 5 cm and a height of 8 cm, with a volume of:

cubic centimeter) rotates on its width axis, resulting in a cylinder with a base radius of 8 cm and a height of 5 cm, with a volume of:

cubic centimeters) with a wide axis rotation of the volume is large, large:

cubic centimeters).

Divide by 4 5 = 160

3 Senhuidan5 = 270 trees.

270 divided by 6 7 = 315

30 * 1 5 = 6 tons.

30-6 +30 = 54 t

54 tons = 54,000 kilograms.