The first grade mathematics Su teaches printing plate examination paper.

1. Fill in the blanks: (2 points for each question, 26 points)

1.(-0. 1)×(- 100)= .

2.5 rational numbers are multiplied, and their product is negative, so there is a negative factor.

3. Three times as much as-12.

4. When x=, 3 ÷ (x-5) is meaningless.

5. Calculation: ① (-5) 2 = ②-52 = ③-(-5) 2 =

6. Represented by scientific symbols:

The radius of mercury is 24400 meters.

② The ocean area on the earth is about 36 1000000 square kilometers.

7. According to the requirements in brackets, approximate the following figures by rounding:

①7.9 122 (accurate to one place)

②63480 (two significant figures are reserved)

Four. (4 points)

A city has a population of 4 million, and each person needs domestic water150kg every day, so this city needs domestic water every day.

How many kilograms?

Seven. (6 points) A supermarket provides preferential shopping for customers, and the regulations are as follows: if the shopping is dissatisfied with 200 yuan, there will be no discount; One-time shopping in 200 yuan, but not more than 500 yuan, 10% off the list price; If the shopping trip exceeds 500 yuan, 10% discount will be given for the part that does not exceed 500 yuan, and 20% discount will be given for the part that exceeds 500 yuan.

(1) If Xiaoming pays 198 yuan at one time, what is the actual value of what Xiaoming bought?

(2) How much does Xiao Gang have to spend to buy goods priced in 330 yuan?

(3) How much does it cost for Xiaohua to buy an item with a price of 555 yuan?

Vi. (5 points for each question, 10)

(1) known value.

(2) If A is the largest negative integer, the reciprocal of B is 2.

Find the value of.

Two. Fill in the blanks (2 points for each question)

1. Find the pattern and fill in the missing numbers, -6, -4, _ _ _ _ _, _ _ _, 2, 4.

2. The number corresponding to point A on the number axis is +5, and the number corresponding to point B is -2, so the distance between point A and point B is _ _ _ _ _ _ _ _.

3. The reciprocal of-is _ _ _ _ _ _ _, and the reciprocal of _ _ _ _ _ is 0.

+(—3.5)= ____________ ,+[—(+3.5)]= ____________

4. There are _ _ _ _ _ _ numbers whose absolute value is equal to 2, they are _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

The absolute value of the reciprocal of 3 is _ _ _ _ _ _ _, and the absolute value of -3 is the opposite.

The number is _ _ _ _ _ _ _

5. Fill in the blanks with "="

—(—5) __________—∣—5∣,∣—∣ _______—(+3)

—___________—∣—∣,—(+)_________—∣0.5∣

6. A positive integer with an absolute value less than 2 is _ _ _ _ _ _ _ _ _ _

7. A positive integer whose reciprocal is greater than -4 is _ _ _ _ _ _ _ _

8. If ∣ x-2 ∣ = 0, then x = _ _ _ _ _ _ _ _ _

4. Fill in the corresponding brackets for each column of figures.

—7，3. 10，5%， 10，000，2003，0.33，0. 142，+0. 1，o，—

—(—3), ∣2 ∣,

Integer set ()