1, which is not algebraic in the following formula is ()
A.3a+2b B.5+2 C.a+b= 1 D。
2. In the following four sentences, the correct number of sentences is ()
The reciprocal of (1)-5 is 5, and the reciprocal of (2)-5 is
(3) The absolute values of 5 and 5 are all 5 (4) The reciprocal, reciprocal and absolute values of zero are all zero.
1。
3, the following four formulas is correct ()
A. 0, then the symbols of a and b are ().
A.+，+ B.-，- C.+，- D.-，+
8. As shown in the figure, the numbers represented by two points on the number axis are m and n respectively, so the following statement is ().
A.m+n>0 B.m+n0 D.m-n=0
9. given that a+b=0 and A > B, the value of | A |+| B | is ().
A.0 B.a+b C.b-a D.2a
10, the following four equations are ().
A.B. C. D。
1 1.578000 is rounded to two significant figures and the approximate value is ().
57-58 AD
12, the number of monomials in the following algebraic expressions is ()
，0， 1-x，2xy，，- 100
1。
13, the following four monomials have correct coefficients and times ().
A. The coefficient is 1 and the degree is 2b. The coefficient is 3.
C. The coefficient is 1 and the degree is 2 d. The coefficient is -5 and the degree is 3.
2. Fill in the blanks (1 ~ 8 questions are 2 points each, 9 questions are 2 points each 1 point, ***37 points)
1、(-5)+(-6)=_______,(-5)-(-6)=_______;
2、(-5)×(-6)=_______,(-5)÷6=_______;
3、(-2)2×(-)=_______,=_______;
4、(-3)3×=_______,-32÷=_______;
5、=_______, 1÷2×=_______;
6. The number whose square is equal to 64 is _ _ _ _ _, and the cube of _ _ _ _ _ is equal to-64;
7, 345000 with scientific notation as _ _ _ _ _ _;
8. If | x | = 3, then x+1= _ _ _ _ _;
9. Fill in the following figures in the corresponding brackets:
1 1,,6.5,-8,,0, 1,- 1,-3. 14
Positive number set {…}
Negative set {…}
Integer set {…}
Music score setting {…}
Positive integer set {…}
Negative integer set {…}
Positive fraction set {…}
Negative fraction set {…}
Rational number set {…}
Draw a number axis, and mark the following numbers on the number axis, and use these numbers as "
,,0,3.5,-5
Four. Calculation (1 ~ 3, 4 points for each question, 6 points for 4 questions, *** 18 points)
1、
2、
3、
4. Find the values of a= 1 and b=-2 times number expressions.
5. How many terms are there in the polynomial? In descending order of a, and then in descending order of b. (5 points)
6. As shown in the figure, the length of the rectangle is a and the width is b, and an arc is made with the two vertices of the rectangle as the center. (7 points)
(1) Use algebraic expression to represent the area of the shaded part in the diagram;
(2) And calculate the shadow area when a = 5 and b = 3. (accurate to 0.0 1)
Seven, choose to do the problem: (65438+ 00 points for each problem, ***20 points)
1, if (a+2) 2+| b-a | = 0, find the value of the algebraic formula a3-3a2b+3ab2-b3.
2. When x=-2, the algebraic expression x3-ax-3 has a value of 3. Find the value of x=-3 times number expression x3-ax-3. Mid-term math test paper answers 1, 1, C 2, C 3, D 4, C 5, A 6, B 7, a.
8、A 9、D 10、C 1 1、D 12、D 13、D
2. 1, - 1 1, + 1 2, 30, 3, -2, -8 4, - 1, -8 1.
5, -2, 6, 8, -4 7, 3.45× 105 8, 4 or -2
9. Positive set {1 1, 6.5, 1, …} negative set {,-8,-1, -3. 14, …}
Integer set {1 1,-8,0, 1,-1, …} Fraction set {,6.5, -3. 14 …}
Positive integer set {1 1, 1, …} negative integer set {-8,-1, …}
Positive fraction set {6.5, …} Negative fraction set {,-3. 14, …}
Set of rational numbers {1 1, 6.5,-8,0, 1,-1, -3. 14...}
Third, draw three points on the correct axis and mark two points on the axis, according to "
Sketch. -5