* = 0; 2; 4; 6; 8 2

2. * = 0; 2; 4; 6; 8 2. * = 0; 2; 4; 6; 8 1,02a) x + 3 = 0

^

x = - 3 a) x + 5 = 0

^

x = - 5 0,5(3,0đ)b) x - 7 = 0

^

x = 7 b) x - 9 = 0

^

x = 9 0,5c) 2x - 3 = 5

^

2x = 8c) 2x - 5 = 7

^

2x = 120,5

^

x = 4

^

x = 6 d) 3x + 5 = 11

^

3x = 6d) 3x + 7 = 13

^

3x = 6

^

x = 23

1 3

4

1 5

6

2 2



 

2

2

2 2



 

2

3

0,5(2,0đ) a) a)

7 4

3

5 2

3

3 3



 

3

1

3 3



 

3

1

0,5b)

1 4

2

1 8

2

2 3

.



3

4 3

.



3

0,5c)

4 2

4 15

5 10

5 3

1

:

.

6

:

.

6 3



6 10



4

5 15



5 2



0,5d) 4a) 1,2x - 0,8 = 1,6

^

1,2x = 2,4a) 1,6x - 0,8 = 2,4

^

1,6x = 3,20,25(1,0đ)

^

x = 2b) 3,5x + 0,5 = 3x

^

0,5x = - 0,5b) 2,5x + 0,5 = 2x

^

0,5x = - 0,5

^

x = -1