Class: _ _ _ _ _ _ Name: _ _ _ _ _ Score: _ _ _ _ _ _ _

I. Fill in the blanks (1 each blank, 30 * * *)

A cube is surrounded by _ _ _ faces, with _ _ _ vertices and _ _ _ edges. A cylinder is surrounded by _ _ _ faces.

3. If 5℃ above zero is recorded as +5℃, then 3℃ below zero is recorded as _ _ _ _.

3. If a < 0, then a _ _ _ _ 2a (fill in the blanks with, =).

4.74, in the cardinal number is _ _ _ _ _ _, the index is _ _ _ _ _, in (-2) 3, the cardinal number is _ _ _ _ _ _ _ _ _.

⒌(- 1)2000=__________, (- 1)200 1=___________,- 12002=_____________。

6.A minus 70 15% can be expressed as _ _ _ _ _ _ _ _.

If the side length of a cube is a, then the volume of the cube is _ _ _ _ _ _ _, and the surface area is _ _ _ _ _.

⒏ The single digit of a two-digit number is A and the ten-digit number is B. Please use an algebraic expression to indicate that this two-digit number is _ _ _ _ _ _ _ _ _ _ _ _.

(9) The lengths of the three sides of a triangle are 2x, 4x and 5x respectively, and the circumference of this triangle is _ _ _ _ _ _ _ _ _.

⒑ In three consecutive even numbers, n is the smallest one, and the sum of these three numbers is _ _ _ _ _ _ _.

5. Please explain the meaning of the following algebraic expressions:

6P:_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

a2-B2:_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

25a+ 12b:_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ .

5] The price of a commodity is X yuan, so 1/2x can be interpreted as _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

12、( 1) 0.25 =_____′_____〃 (2) 1800〃=_____′_____

⒔ Fillet = _ _ _ _ _ Flat angle = _ _ _ _ Right angle = _ _ _ _ _ _ degrees.

Second, true or false questions (65438+ 0 points for each question, ***6 points)

1, rational numbers are divided into positive numbers and negative numbers. ( )

2. The absolute value of rational number must be greater than 0. ( )

3 、( 3x-2)=-3x-2()

4、8x+4= 12x()

5、3(x+8)=3x+24()

6、3x+3y=6xy()

Choice (2 points for each small question, *** 12 points)

1, if | a |a|=4, then a = ()

A, 4 B,-4 C, 4 or-4 D, neither.

2, the reciprocal of -3/8 is ()

a 、-3/8 B、8/3 C、8/3 D、3/8

3. subtract 3 from the number n and enlarge it by 5 times. The final result is ()

a、n-3×5 B、5(n-3) C、n-3+5n D、5n-3

4. In a class * * *, there is student A, of which 35% are boys, so the number of girls is ().

a、35%x B 、( 1-35%)x C、x/35% D、x/ 1-35%

5. Point out the shape symbol () of the geometric section in the drawing.

A.B. C. D。

Three. Calculation (3 points for each small question, *** 12 points)

1、( 1/3+ 1/4- 1/6)×24

2、0-23÷(-4)3- 1/8

3、(-2)3×0.5-(- 1.6)2/(-2)2

4、23÷[(-2) 3 -(-4)]

Four, simplify the following categories (3 points for each small question, *** 12 points)

1、2(2a2+9b)+3(-5a2-4b)

2、a+(5a-3b)-(a-2b)

3、3n-[5n+(3n- 1)]

4、a-(5a-3b)+(2b-a)

V. Simplify first, then evaluate (5 points for each small question, *** 10)

1, (3a2+7bc-4b2)-(5a2-3bc-2b2)+ABC, where a = 5, b = 1/3 and c = 3.

2. (5a2-3b2)+[(a2+B2)-(5a2+3b2)], where a =- 1 and b = 1.

We have finished the exam, only solving equations, simplifying calculation, filling in the blanks and simplifying evaluation! Just review it carefully ~

Come on!