1. Given m= 1, n=0, the value of algebraic expression m+n is ().
A.﹣ 1B. 1C.﹣2D.2
2. Given x2 ~ 2x ~ 8 = 0, the value of 3x2 ~ 6x ~ 18 is ().
A.54B.6C.﹣ 10D.﹣ 18
3. Transform the equation into x=2 according to ().
A. the properties of equation1b. Properties of Equation 2
C. Basic properties of fractions D. Properties of inequalities 1
4. Given x2-2x-3 = 0, the value of 2x2-4x is ().
A.﹣6B.6C.﹣2 or 6d. Still 30 years old.
5. If m-n =- 1, the value of (m-n) 2-2m+2n is ().
A.3B.2C. 1D。 ﹣ 1
6. Given x = 3, the value of 4-x2+x is ().
65438 BC
7. According to the operation program shown in the figure, the output result can be 3, and the values of x and y are ().
a.x=5,y=﹣2b.x=3,y=﹣3c.x=﹣4,y=2d.x=﹣3,y=﹣9
8. If m+n =- 1, the value of (m+n) 2-2m-2n is ().
A.3B.0C. 1D.2
9. Given that x-2y = 3, the value of algebraic expression 6-2x+4y is ().
A.0B.﹣ 1C.﹣3D.3
10. When x= 1, the value of algebraic expression AX3-3bx+4 is 7, and when x =- 1, the value of this algebraic expression is ().
A.7B.3C. 1D。 ﹣7
1 1. The figure is a schematic diagram of the operation procedure. If the initial input value of x is 8 1, the output result of the 20th14th time is ().
A.3B.27C.9D. 1
Fill in the blanks (* *18)
12. Given that the solution of equation 3a-x =+3 about x is 2, the value of algebraic expression a2-2a+ 1 is.
13. it is known that x=2 is the solution of equation a(x+ 1)=a+x about x, then the value of a is.
14. Follow the operation steps as shown in the figure. If the input value is 3, the output value is.
15. If a-2b = 3, then 2a-4b-5 =.
16. If m2-m = 6, then1-2m2+2m =.
17. When x= 1, the algebraic expression x2+ 1=.
18. If m+n=0, then 2m+2n+ 1=.
19. Calculate according to the program shown in the figure. If the input value of x is 3, the output value is.
20. According to the operation steps as shown in the figure, if the' value of input x is 2, the output value is.
2 1. Given that the solution of equation 2x+A-5 = 0 about x is x=2, then the value of a is.
22. Liu Qian's magic show is popular all over the country. Xiaoming also learned that Liu Qian invented a magic box. When any real number pair (a, b) enters it, a new real number will be obtained: a2+b﹣ 1. For example, if (3, ﹣2) is put in, 32+ (.
23. If the value of x= 1 times number expression 2ax3+3bx+4 is 5, then the value of algebraic expression 2ax3+3bx+4 is.
24. If x2 ~ 2x = 3, the values of algebraic expressions 2x2 ~ 4x+3 are.
25. If m2 ~ 2m ~1= 0, the value of algebraic expression 2m ~ 4m+3 is.
26. Given x(x+3)= 1, the value of algebraic expression 2x2+6x-5 is.
27. Given x2 ~ 2x = 5, the value of algebraic expression 2x2 ~ 4x ~ 1 is.
28. The following is a simple numerical operation program. When the input value of x is 3, the output value is. (calculate or write with a scientific calculator).
29. There is a digitizer whose principle is shown in the figure. If the value of x is 7 at the beginning, we can find that the output result of 1 is 12, the output result of the second time is 6, the output result of the third time is to continue in turn …, and the output result of 20 13 is.
Third, answer questions (* *1small questions)
30. Known: a=, b = |-2 |,. Find the value of algebraic expression: a2+b | 4c.