1. 1. 1
① Count: 8, 100 Measurement: 36, 100 Label: May, 2008, 1.
②B species
484448? 2? (2)? 3? (3)? 6? 999393
( 1? 15%)? ( 1? 15%)? 0.9775 < 1 has changed, which is cheaper by ④ 1? ③( 1)
(5) (1) 4.7 yuan (2)25 yuan
1.2. 1
(1) (1)-200 (2) 3.5 tons were shipped out and 2.5 tons were brought in. (3) The turntable turned six times clockwise. (4) 2.5m-3m0m。
54 12, 0. 1 1, +9.87, +0.99 Negative score: -2.7, -67 13.
54 12 positive rational number: 15, 0.1,+9.87, +69, +0.99 negative rational number: -2.7,-2167/kloc-.
1 1 1③ natural number: 1, 2 negative integer:-1, -2 positive fraction: negative fraction:-,-223② positive integer: 15, +69 negative integer:-
(4) (1) income 5 12 yuan spent 4200 yuan income 1200 yuan (2)805 is the income of store a-150 is the output of store a (3) the balance after one week.
1.2. 1 ③4 -a-34 3
Yes, the number is 2.
④ 1.5
1.3. 1
① è-1 乸 = 1 乸-12 乸 = 12 乸 0 乸 =0 乸1..
②30 33 =7 44 1 6
3 wrong right.
④ Positive number or 0, negative number or 0.
⑤ The first time is 12, the second time is 4 and the third time is 8. Practical significance: This car has been driving for 24km.
1.4. 1
3 wrong right.
Summary:
Positive integer, negative integer, positive fraction, negative fraction, origin, unit length and positive direction are opposite to each other. The distance between the origins on both sides of 0 is itself, and its opposite number 0 is greater than 0, and its positive and negative numbers are greater than 0.
Objectives and evaluation:
① 1. Room 2. postcode
② Decimal: 0.6 Decimal: 3.5
7 15③ Length: 15m Width: 7m 7? 15=
④ Option 3
⑥0 0 -5. 1 5. 1 9 1
⑨- 100? 0. 1 ? 75 13 12
⑩-4,-3,-2,- 1,0, 1,2,3,4
(1)S=- 1 (2) A: S is a positive and negative number, and the absolute value of Q is the largest because it is the farthest from S.
The diameter of 44.97mm is qualified and 45.04mm is unqualified.
chapter two
2. 1. 1
①-4 1288- 14-6-6℃
②5 -7 -3 0
③ 0 - 1 1 -5.9 3.6 - 34 76
④ (-150)+(+2060) =1910 yuan.
⑤(-56)+(80)=24℃
⑥ Xiaoming deposited 200 yuan as +200 yuan in the bank, so he took 100 yuan as-100 in the bank. How much is left now?
2. 1.2
①2 -2 -3.5 - 14
②-3.3 - 1 1 2
③ Income is 23.3 yuan
④330kg
⑤( 1)(- 1)+(-2)+(-8)=- 1 1
(2)(- 1)+(-2)+3=0
2.2. 1
①3 13 -3 - 13 4 -4
②8 3 - 1 1 0 6
③-2 -5 -9 - 12 - 17
④ 1.8-2=-0.2m Answer: 0.2m below the warning line.
⑤( 1)-7 (2)0
⑥( 1)- 10(2)2
2.2.2
①-2 -6 1 2 1 4
4 3②-7 50 83 -
③-40
④- 1 1+ 15-7 =-3m
⑤9
2.3. 1
①=