1) X^2-X-6=0
2) 2X^2-3X-2=0
3) -3X^2+6X=2
4) 4X^2-4X+ 1=0
5) X^2-2X+3=0
6) -X^2-2X+8=0
7) X^2-X-2=4
8) 2X^2-3X+ 1=0
9) -3X^2+4X+4=0
10)4x^2- 1 1x-3=3
1 1) x^2-2x-3=0
12) 4x^2- 1=0
13) 5x^2-3x+2=0
14) -x^2-2x+8=0
15) -2x2+x+3=0
16) 2x^2+3x-9=0
17) x^2-9=0
18) 4x^2- 10x-6=0
19) 5x^2-8x-4=0
20) 3x^2+4x-4=0
2 1) 6x^2+7x-5=0
22) x^2-8x+ 12=0
23) 2x^2-6x+3=0
24) 2x^2+9x-5=0
25) 3x^2- 16x+5=0
26) 2x^2- 1 1x+5=0
27) 4x^2- 16x+7=0
28) 10x^2-9x-7=0
29) 2x^2- 13x-7=0
30) 2x^2-3x-2=0
3 1) -2x^2+3x- 1=0
32) 2x^2- 17x-9=0
33) 2x^2-x-6=0
34) 12x^2+ 16x-3=0
35) 6x^2- 13x+2=0
36) 3x^2-7x+2=0
37) 5x^2- 1 1x+2=0
38) 2x^2-9x+9=0
39) 2x^2+3x-9=0
40) x^2+2x-3=0
4 1) x^2-6x+5=0
42) x^2-3x+2=0
43) x^2- 12x+32=0
44) x^2+6x- 16=0
45) 3x^2- 12x- 15=0
46)2x^2- 1 1x-2 1=0
Equation.
1.x-y=2
2.xy= 15 (x=5，y=3)
3.x+y=6
4.x-y=2 (4，2)
5.x+y= 1 1，xy=30 (x=5，y=6，x=6，y=5)
6.x+y= 13，xy=42 (x=6，7，y=7，6)
7.x+y= 1 1，x-y= 1 (x=6，y=5)
8.x+y= 12，xy=35 (x=5，7，y=7，5)
9.x+y=5，xy=6 (x=2，3，y=3，2)
10.x-y=5，xy=36 (x=6，y= 1)
1 1.x+y= 10，xy=25 (x=y=5)
12.x+y= 17，y-x= 1 (x=8，y=9)
13.xy=2，x-y= 1 (x=2，y= 1)
14.x+y=3，xy=2 (x= 1，2，y=2， 1)
15.x+y= 12，xy= 1 1 (x= 1， 1 1，y= 1 1)
16.x-y=8，xy=9 (x=9，y= 1)
17.x+y=4，x-y=2 (x=3，y= 1)
18.x+y=3，xy=0 (x=0，3，y=3，0)
19.x-y=5，xy=6 (x=6，y= 1)
20.y-x=3，xy=28 (x=4，y=7)
2 1. 19，y-x=2，xy=24 (x=4，y=6)
22.x+y=9，x-y= 1，(x=5，y=4)
23.66 x+17y = 396725x+y =1200 answer: x=48 y=47.
24.18x+23y = 230374x-y =1998 answer: x=27 y=79.
25.44x+90y=7796 44x+y=3476 Answer: x=79 y=48.
26.76x-66y=4082 30x-y=2940 Answer: x=98 y=5 1.
27.67 x+54y = 8546 71x-y = 5680 answer: x=80 y=59.
Simplified evaluation (representative square)
1. Given | a+3 |+(b- 1) = 0, find the value of 3a-2ab+b.
2. Given (a-1)+4 (b+2)+| c+1| = 0, find the value of (a-ac+c)-2 (a+bc-2c).
3.(3x-2y-3xy)-(2x-3y+xy), where x+y = 2 and xy =- 1.
(-a-ab+b)-(-a+2ab+b), where a =-115 and b = 10.
5. It is known that | a+ 1/2 |+(b-3) = 0. Find the value of the algebraic expression [(2a+b)+(2a+b) (b-2a)-6b] \ \ (2b). 6.10a (5 times the square of a-b)-2a (25 times the square of 5b+a)-3ab, where a = 1 and b =1/23.7.1/3x3-2x2+2/.
8.5abc-{2a？ b[3abc-(4ab？ -a？ b)]-2ab？ } where a =-2, b = 3 and c =- 1/4.
9. known a? +a- 1=0, find the algebraic expression a? +2a？ The value of +5.
The quadratic form of10. (a+2)-(a-1) (a+1), where a = 3.25 is simplified first and then evaluated.
1 1.(X- 1) quadratic +(x+3) (x-3)+(x- 1), where the quadratic of x -2x =2.
12. It is known that A +b = 12, and the square of A+the square of B =74 to find the value of ab.
13. Simplify first, and then find the square of (4x-3y) -(3x-2y)(3x+2y), where x = 2 and y = 1.
14. Simplified evaluation: (1+a-5a)-(- a +2a), where a=-3.
15. Given 3/3 a=4/3 b=5/3 C, find the value of 2a+b+c in the algebraic expression 2b-a.
16.(x-3) 2+| y+2 | = 0, then the value of yx is ().
17. let a, b and c be rational numbers, and |a|+a=0, |ab|=ab, |c|-c=0 to find the value of the formula | B |-| A+B |-C-B |+| A-C |.
18.9x+6x 2-3 (x-2/3x 2), where x =-29x+6x2-3x+11/3x2 = 6x+29/3x2 = 6 * (2
19.1/4 (-4x2+2x-8)-(1/2x-1), where x =1/2-x2+1/2x-.
20.(5a 2-3b 2)+(a 2+b 2)-(5a 2+3b 2), where a =- 1, b = 1 5a 2-3b 2+a 2+b 2.
21.2 (a2b+ab2)-2 (a2b-1)-2ab2-2, where a =-2 and b = 22a2 * 2b+2ab2-2a2 * 2b-2a.
I'm so tired. I've found so many questions. Give me 10.