Unit 1 examination paper 1. Fill in the blanks (10 questions, each with 2 blanks, each with 1 score ***20 points)
1. Go south -200m, which means: expenditure 100 yuan, equivalent to income yuan.
2. The number whose absolute value is greater than itself is; The number whose absolute value is equal to itself is.
3. If it rises by 10m and then by -7m, * * * will rise; Originally 2m, it dropped 7m, but now it is.
4. The conditions of ∣ A+B ∣ = ∣ A ∣+∣ B ∣ are; ∣ A-B ∣ = ∣ A ∣+∣ B ∣ The conditions are.
5. In the number 1 12, 1 1 is and the power is.
6.-35, 5 is, its meaning is.
7. Compare the following scores: 2/3 4/5 -2/3 -4/5.
8. When the minimum value of ∣ x+1∣+∣ x-2 ∣+∣ x-1∣ is.
9. The number 3.5× 104 has a significant number, which is converted into a common form.
The primitive number of 10. Approximation number 1.5 is not less than, but less than.
Second, choose (10 questions, 2 points for each question, ***20 points)
1. The smallest positive rational number is ()
A.0b.1c.0.1d.No.
2. The following calculation is correct ()
A.(+20)+(-30)= 10 b .(-3 1)+(- 1 1)=-20 c .(-3)+(+3)= 0
D.(-2.5)+(+2. 1)=0.4
3. It is known that ABC > 0, A > C and AC < 0, and the following conclusion is correct ().
A.a0，b>0，c0，b