1, the difference between the reciprocal of a and the reciprocal of b, expressed by algebra.

2.A is acm, B is bcm shorter than A, and B is cm.

3. The algebraic expression a2+b2 means.

4. When x= and y=, the algebraic expression x (x-y) =.

5. The straight line defining the origin, positive direction and sum is called the number axis.

6. The number whose absolute value is equal to 5 is.

7. The relationship between and is.

8.In-36, the cardinal number is.

9、(— 1)200 1= 。

10、—(—3)=

; .

1 1, if -2x= 10, then x=.

12. Let the reciprocal of A be the largest negative integer and the absolute value of B be the smallest number, then B-A =.

13,80340 is expressed by scientific counting method and should be recorded as.

The reciprocal of 14 and -|-2 | is.

15, the reciprocal of a number is itself, and this number is.

Second, multiple-choice questions (choose a correct answer from the following four answers, 3 points for each small question, *** 18 points).

One of 1, x=y, a, x+ 1, 3x-2 = 0 is algebraic. ( )

a、 1 B、2 C、3 D、4

2. There is an integer whose absolute value is less than 3. ( )

a、7 B、6 C、5 D、2

3. Let A be an arbitrary rational number, then a2 is always ().

A, greater than a, b, nonnegative, c, positive d, less than a.

4, two opposite numbers that are not equal to zero, and their ()

A, product is-1b, product is 1 C, quotient is-1d, and quotient is 1.

5, the following four approximate figures, including three significant figures is ().

a，0.3 140b，0.03 140c， 1.3 14d，3 140000。

6, the following statement is correct ()

A, non-negative numbers are positive numbers and zeros, b, the smallest integer is 0,

C, integer is a general term for positive and negative integers, and the inverse of d, |-6 | is 6.

Iii. Answering questions (***50 points)

1, calculation (6 points for each small question, *** 18 points)

( 1)、 12—(— 18)+(—7)— 15

(2)( )×( )÷( )

(3)— 10+8÷(—2)2—(—4)×(—3)

2, solve the equation (6 points) 3x-8 =-24.

Mark the following numbers on the number axis, and then use "

+2,—(+4),+( ),|—3|,— 1.5

4. When A =-7, B =-9 and C =-6, find the algebraic expression.

C2-& amp； niobium (Nb)

sp； The value. (8 points)

5. Let (x-3) 2+| y+ 1 | = 0 to find the value of algebraic expression x2y2. (10)

Fourthly, the application of column equation. (10)

A walks to a place at a speed of 6 km/h, and after 2.5 hours, B catches up with A by bike at a speed of18 km/h. How long can B catch up with A after starting?

5. Let A be the sum of all integers whose absolute value is greater than 1 less than 5, and B be the sum of non-negative integers not greater than 2, and find the value of A, B and B-A ... (12 points).

...

We're also looking for-

I've heard people say that before-

But if you put your heart into it. -

We will start the exam tomorrow -0-