1) 4x+10.4x=13.6

2) 12x=2.4

3) 6x-16=30

4) 12x-4 (8x-2) = 14

5) 0.4x-0.2 (2x-6) = 1.2

6) xквадрат=16

7) 10xквадрат=20

8) 2xквадрат-16=0

1) 4x+10.4x=13.6

14.4x=13.6

x=13.6:14.4

13 6/10=13 3/5=68/5

14 4/10=14 2/5=72/5

x=68/5*5/72=34/36=17/18

2) 12x=2.4

x=2.4:12

x=0.2

3) 6x-16=30

6x=30+16

6x=46

x=46:6

x=7 4/6=7 2/3

4) 12x-4 (8x-2) = 14

12x-32x+8=14

-20x=14-8

-20x=6

x=6: (-20)

x = - 0.3

5) 0.4x-0.2 (2x-6) = 1.2

0.4x-0.4x+1.2=1.2

1.2=1.2

6) xквадрат=16

x^2=16

x=√16

x=4

7) 10xквадрат=20

10x^2=20

x^2=20:10

x^2=2

x=√2

8) 2xквадрат-16=0

2x^2-16=0

2x^2=16

x^2=16:2

x^2=8

x = √8