1) 7/ 12 5/6 2/7 1/5 2 1/2 0 1 25 1

2) ( 1) ( 2 , 4 ) 3 6 (2) ( 6 , 8)

3) Omission

page 2

4)( 1) sketch

(2) It is a floor with a base of 4 cm, a height of 2 cm and an area of 4? 2=8 (square centimeter)

5)( 1) The location of the Children's Palace can be represented by (6,4). It is 600 meters to the east and 400 meters to the north of the school.

The location of the gymnasium can be represented by (3,6). It is 300 meters to the east and 600 meters to the north of the school.

The location of the park can be represented by (9,5). It is 900 meters to the east and 500 meters to the north of the school.

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(2) Omission

(3) A: From home, Zhang Ming went to the Children's Palace, the library, the gymnasium and the shopping mall, and finally went home.

6) ( 1) A(2，5) B (6，5 ) C ( 4，7)

2 sketch, a? (2，2) B？ (6，2) C？ (4 ,4)

(3) sketch, a? (6，9) B？ (6，5 ) C？ (8，7)di

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Improve the article

(1) Shuai (5,0) Shi (5, 1) Bing (5,3) Item (7,0) Ma (7,2) Che (8,4)

(2) The position where the phase can go next is (5,2) or (9,2), and there are other positions to go on.

The same row or column will appear in most places that can be reached at this stage.

(3) There are many answers.

Page 5

1) 1/3 9/20 20 25 1/ 12 4/7 3/2 0

2)( 1) 1 , 3

(2)5/9 , 5/9

(3) 3/5 , 1/3

(4) 2/3 , 10

(5) 40

(6) 6/5 , 9/ 100

3) 5/2 1/80 9 1 6/ 1 1 10

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4)( 1)? (2)? (3)(4)? (5)? (6)

5)( 1)C(2)A (3)B

6) 7/2 14/3

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1 1 30 3/ 16 13 1/5 2/3

7)( 1) 5 1000? ( 1-7/ 10)=5 1000? 0.3= 15300 (ten thousand square kilometers)

(2) 405 ? ( 1+7/45)=405? 52/45=468 (m)

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(3) 2 1000? ( 1- 1/3)? 3/7=2 1000? 2/3? 3/7=6000 (yuan)

Improve the article

1) 1/2 1/2 1/6 1/6 1/ 12 1/ 12 1/20

1/20 1/30 1/30 1/42 1/42

Because the numerator is 1, the difference between the two fractions of the denominator coprime is equal to the difference between the denominator as the numerator and the product of the denominator as the denominator.

2) The original formula =1-1/2+1/2-1/3+1.

3) The original formula =1-1/2+1/3+1/3-1/4+1.

Page 9

1) 1/20 1 1/4 7/3 2 3/7 12 1/6 9 5

2) ( 1) 8/9 9 1/9

(2) 3/2? 3/8=4 3/2? 4=3/8

(3) 4/3 1/ 12

(4)>& gt& lt& lt= & lt

3) ( 1) ? (2) ? (3) ? (4)

Page 10

4)( 1) A (2) B (3) C (4) C

5)( 1) 7/9? 35/36=4/5

(2) 4/5? 3/4=3/5 (ton)

(3) 8? 2/3? 1/6=8? 3/2? 1/6=2

(4) 180? 1/3? 2/3=60? 3/2=90