1.
а)2(х2-2х+3)-3(2х2+х-1)
2*3-3(4х+х-1)
6-3(5х-1)
6-15х+3
9-15х
b)-4b(b2-2b)-2b(3b-b2)
-4b*0-2b(3b-2b)
0-2b*b
-2b^2
c)4(2x-3y)-(2x+5y)+3(y-2x)
4(2x-3y)-(2x+5y)+3(y-2x)
8x-12y-2x-5y+3y-6x
0-14y
-14y
2.
a)2(1-3x)=14
1-3x=7
-3x=7-1
-3x=6
x=-2
b)8-3(y-2)=4
8-3y+6=4
14-3y=4
-3y=4-14
-3y=-10
y=10/3
c)2(x-3)+4(x+3)=0
2x-6+4x+12=0
6x+6=0
6x=-6
x=-1
d)y(2-3y)+3y(1+y)=15
y(2-3y)+3y(1+y)=15
2y-3y^2+3y+3y^2=15
5y=15
y=3
e)2(x-1)-3=5(2x-1)-7x
2x-2-3=10x-5-7x
2x-5=3x-5
2x=3x
2x-3x=0
-x=0
x=0
f)2x(6x-2)=7x(2x-4)-2x2
12x^2-4x=14x^2-28x-4x
12x^2=14x^2-28x
12x^2-14x^2+28x=0
-2x^2+28x=0
-2x(x-14)=0
x(x-14)=0
x=0 x-14=0
x=0 x=14
3х-у=3, 2. 2х-3у=1, 3. 2х+у=1, 4. х+у=6,
3х-2у=0. 3х+у=7. 5х+2у=0. 5х-2у=9.
5. х+5у=7, 6. х+у=7, 7. 4х-3у=-1, 8. х+2у=-2,
3х+2у=-5. 5х-7у=11. х-5у =4. 3х-у=8.
9. 2х-5у=-7, 10. х-у=3, 11. 3х-5у=16, 12. 2х+3у=-7,
х-3у=-5. 3х+4у=2. 2х+у=2. х-у=4.
13. 2х+5у=-7, 14. х-3у=8, 15. 2х-3у=5, 16. х-4у=-1,
3х-у=15. 2х-у=6. х-6у=-2. 3х-у=8.
17. 5х-4у=12, 18. 6х+у=5, 19. 2х-3у=11, 20. х-6у=-2,
х-5у=-6. 2х-3у=-5. 5х+у=2. 2х+3у=11.
21. 3х-2у=16, 22. 2х+3у=3, 23. 4х-2у=-6, 24. 3х+2у=8,
4х+у=3. 5х+6у=9. 6х+у==11. 2х+6у=10.
25. 5х+у==14, 26. 3х-2у=5, 27. х+4у=7, 28. 2х-3у=5,
3х-2у=-2. 2х+5у=16. х-2у=-5. 3х+2у=14.
29. х-2у=7, 30. 4х-6у=26, 31. х+3у=7, 32. 8х+3у=-21,
х+2у=-1. 5х+3у=1. х+2у=5. 4х+5у=-7.
33. х-2у=8, 34. 8х+2у=11, 35. 2х-у=13, 36. 7х+3у=1,
х-3у=6. 6х-4у=11. 2х+3у=9. 2х-6у=-10.
37. 2х+3у=10, 38. 3х-2у=5, 39. 2х+у=-5, 40. 2х+3у=1,
х-2у=-9. 5х+4у=1. х-3у=-6. 6х-2у=14.
