People's education printing plate seventh grade first volume mathematics midterm examination questions

People's education printing plate seventh grade mathematics first volume midterm examination questions

The reciprocal of the absolute value of 1 |-2 | Yes ().

(a)2(b)2(c)2(d)2。 The following figures are negative ().

(A)-(-4)(B)-|-4 |(C)(-2)2(D)-(-2)3

3. If three rational numbers are multiplied and the product is greater than zero, the number of negative factors ().

(A) 1 (B)2 (C)3 (D)2 or 0 negative factor

4. Among the following statements, () is correct.

(1) Any rational number has its inverse.

(2) Any rational number has a reciprocal.

(3) The sum of two rational numbers must be greater than either addend.

(4) Two negative rational numbers, the larger one has the smaller absolute value.

(5) The square of a number is always greater than itself

1 (B)2 (C)3 (D)4。

5. The following statement is true ().

(a) Approximation 3.70 has the same accuracy as 3.7.

(b) The figure of about 30,000 people is as accurate as the figure of 30,000 people.

(d) The rational number 5938 is 5940 if it is accurate to ten places.

6. Remove the brackets in Equation 3(x- 1)-2(x+5)=6, and the correct result is ().

(A)3x-3-2x+ 10 = 6(B)3x-3-2x- 10 = 6

7. Xiaoming deposited 2000 yuan lucky money in the bank, with an annual interest rate of 2.25%. After paying 20% interest tax in the bank a year later, Xiao Ming should be able to get it back ().

(1) 45 yuan (2) 1636 yuan (3) 2036 yuan (4) 2045 yuan.

8. The diagram is a simple operating procedure:

Input x →-3 →× (-3) → output the result.

To make the output result 3, you need to enter the value of x as ().

(A)3 (B) to 3 (C)2 (D) 0

9. The picture on the right shows the calendar of August 2006, as shown in the figure.

Circle three numbers vertically with a circle. If it's circled,

The sum of three numbers is 39, so it is the smallest of these three numbers.

The number is ().

1 (B)2 (C)6 (D)8

10. This semester, Jin Man Keke Middle School held a math contest with 20 questions, of which 5 points were scored for answering one question correctly, 2 points were deducted for not doing it, and 0 point was scored for not doing it. If a student finishes all the questions and gets 79 points, the question he did correctly is ().

(A) 15(B) 16(C) 17(D) 18。

Second, fill in the blanks:

1 1. -3 and 3 are _ _ _ _ _.

12. Among the four rational numbers (-1) 3, (-1) 2, -22 and (-2) 2, the sum of the maximum number and the minimum number is equal to _ _ _ _ _ _ _.

13. the solution of equation 2( 1-x)=3(x- 1) is _ _ _ _ _ _ _.

1470 million universal scientific notation is expressed as _ _ _ _ _ _ _ _.

15. The positions of rational numbers A and B on the number axis are shown in the following figure:

b a 0

Then a, b, -a and -b are _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

16. As we all know, the speed of a ship in the current is meters kilometers per hour, and the speed of the current is 2 kilometers per hour, so the speed of a ship sailing in the current is _

Students, you have been in Dainan Middle School for two months. Today is the time to really test how much progress you have made, and it is also the time to repay your parents with excellent results. I wish you excellent grades!

First, multiple-choice questions (3 points for each question ***30 points)

1, the following statement is true ()

A, the minimum rational number is 0 B, and the minimum positive integer is 0

The negative number with the smallest absolute value of c is-1 D, and the rational number with the smallest absolute value is 0.

2. If the absolute value of a number is equal to its reciprocal, then this number is ().

A, positive b, negative c, non-positive d, non-negative

3. The non-negative number whose absolute value is less than 5 is ()

a，9 B，5 C，4 D，2

4. If │a│=2, │b│=3, and the numbers of A and B are different, then a+b = ().

A, 5 b, 1 c, 5 or 1 d, 5

5, known as: a > 0, b < 0, and │ a │ > │ b │, then the following relationship is correct ().

a、b