2. Решите уравнения: а) 2,6(х - 2) = 1,8(x - 4) б) 5,6 - 3(2 - 0,4x ) = 0,4(4x + 1) в) |2x +4| =8 г) |3-7x|+6 =2 д) 13|x| - 11 = -5|x|+43 26 26 26 16 26​

Ответ:

a) 2.6(x - 2) = 1.8(x - 4)2.6x - 5.2 = 1.8x - 7.2

0.8x = 2

x = 2.5

b) 5.6 - 3(2 - 0.4x) = 0.4(4x + 1)5.6 - 6 + 1.2x = 1.6x + 0.4

-0.4x = -1.2

x = 3

c) |2x + 4| = 82x + 4 = 8

2x = 4

x = 2

-2x - 4 = 8

-2x = 12

x = -6

d) |3-7x|+6 =2

3-7x+6=2

3-7x=-4

7x=7

x=1

-3+7x+6=2

7x=-1

x=-1/7

e) 13|x| - 11 = -5|x|+4313|x| - 11 = -5|x| + 43

13|x| = -5|x| + 54

8|x| = 54

|x| = 6.75