Exam examples of the first month of junior one.

2008-2009 school year first semester first monthly examination paper.

Seventh grade mathematics

(Score: 100; Examination time: 100 minutes)

The total score of the topic is one two three four five.

score

commentator

First, choose (this big topic ***8 small questions, 3 points for each small question, ***24 points)

1, and the quantity with opposite meanings in the following groups is ()

A. Ants climb 30cm upwards and 30cm to the left. Earn RMB 2 yuan and return 2 books.

C. East, north D. The spring is extended by 3cm and shortened by 1cm.

2. If the sum of a and -2 is 0, then a is ().

The second century BC.

3. In the following figures, -2, 3, -0.75, -5.4, -3, 0,4, there are _ _ _ integers and _ _ _ positive numbers ().

A.6，4 B.5，5 C.4，3 D.3，6

4, the following statement is correct ()

A. If the sum of two numbers is positive, then both numbers are positive. B. If the sum of two numbers is negative, then both numbers are negative.

C. If the sum of two numbers is zero, the two numbers are opposite. The sum of two numbers must be greater than each addend.

5, the following judgment is correct ()

A. there is no largest positive number, but there is the largest negative number. B. there is the smallest natural number and the largest negative integer.

C. there is no smallest positive number, but there is the largest negative number. D. there is the smallest positive number, but there is no largest negative number.

6. The reciprocal of a number is the largest negative integer, so this number is ().

A.B. C.0 D. 1

7. A food packaging bag is marked with the words "quality is () g". Take out two bags at random, and the difference in quality is at most ().

a . 2g b . 1.5g c . 1g d . 0.5g

8. As shown in the figure, the positions of rational numbers A and B on the number axis are shown in the figure, so the following conclusion is correct ().

①a & gt； b； ②-a & gt； -b； ③a & lt； -b； ④―a & lt； -b； ⑤ .

A.2 B.3 C.4 D.5

score

commentator

2. Fill in the blanks (this title is ***8 small questions, with 3 points for each small question and 24 points for * * *).

1, 350 yuan's expenditure is recorded as -350 yuan, so +600 yuan is _ _ _ _ _ _ _ _ _ _ _.

2. The reciprocal of-(+4) is _ _ _ _ _ _ _, and the absolute value is _ _ _ _ _ _ _.

3. Please write a rational number less than-1.5 _ _ _ _ _ _ _.

4. The number whose absolute value is equal to itself is _ _ _ _ _ _ _, and the number whose absolute value is equal to its opposite number is _ _ _ _ _ _ _ _.

5. On the number axis, the point with a distance of 3 from the origin is _ _ _ _ _, and the point with a distance of 2 from-1 is _ _ _ _ _ _ _.

6. The flight altitude of the plane is 1000m, which rises by 300m first and then descends by 500m during the flight. At this time, the flight altitude of the plane is _ _ _ _ _ _ _.

7. If, ① When A and B have the same number, A+B = _ _ _ _ _ _ _; ② When the numbers of A and B are different, A+B = _ _ _ _ _ _ _.

8. If the absolute value of is equal to, then A is _ _ _ _ _ _ _ _.

Three, calculation (this big topic ***4 small questions, each small question 5 points, ***20 points)

① ②

③ ④

Fourth, compare the size (this big topic ***2 small questions, 4 points for each small question, ***8 points)

① ②

V. Answering questions (4 small questions in this big question, 6 points for each small question, 24 points for * * *).

1, which represents the following numbers on the number axis, with "

, ,―4,0,―3,5

2. An ant crawls back and forth along a straight line from a certain point P, assuming that the crawling distance to the right is positive, the crawling distance to the right is negative, and the crawling distance is in turn (unit: cm):

+5,―4,+ 10,―8,―5,+ 12,― 10

Did the ants finally return to the starting point?

(2) If the ant completes the above distance in 9 minutes, how much distance does the ant walk per minute?

Monday, Tuesday, Wednesday, Thursday and Friday.

Increase or decrease -5+7-3+ 10-4

3. A factory processes a product and plans to produce 250 pieces every day this week. Because workers take turns off, the number of people who go to work every day is not necessarily equal. Compare the actual daily output with the planned daily output. The following table shows: (the number of pieces increased is positive, and the number of pieces decreased is negative).

(1) According to the records, how many products were produced this Friday?

(2) How many products did the day with the most output produce more than the day with the least output?

(3) What is the total product output this week?

4. If A and B are opposite numbers, C is the largest negative integer and D is the smallest natural number, find the value of the formula.

answer

1. 1.d2.a3.a4.c5.b6.d7.c8.a。

Second, 1. Income in 600 yuan is 2.4, 4.3. -Five, etc. 4. Non-negative and non-positive.

5.-3 and 1 6.800 7 , 8.

( 1) 4 (2)-3.4 (3)-4 (4) 2

( 1) (2)

Five, (1) number axis is abbreviated; ―4 & gt； ―3 & gt； & gt0>& gt V.

(2) return to the starting point; Walk 6 centimeters per minute.