Відповідь:

Покрокове пояснення:

1)х=5

-3(1,2х - 2) – (4 – 4,6x) + 6(0,2x – 1) = (-31.2)x + 32 - 4 + 4.6x + (6*0.2)*x - 6

= -3.6x + 6 - 4 + 4.6x + 1.2x - 6 = 0.8x - 4

0.8*(-5) - 4 = -8

2)х=-15

-3(1,2х - 2) – (4 – 4,6x) + 6(0,2x – 1) = (-31.2)x + 32 - 4 + 4.6x + (6*0.2)*x - 6  = -3.6x + 6 - 4 + 4.6x + 1.2x - 6 = 0.8x - 4

0.8*(-15) - 4 = -16

3)х=15

-3(1,2х - 2) – (4 – 4,6x) + 6(0,2x – 1) = (-31.2)x + 32 - 4 + 4.6x + (6*0.2)*x - 6

= -3.6x + 6 - 4 + 4.6x + 1.2x - 6 = 0.8x - 4

0.8*15 - 4 = 8

4)х= -7

-3(1,2х - 2) – (4 – 4,6x) + 6(0,2x – 1) = (-31.2)x + 32 - 4 + 4.6x + (6*0.2)*x - 6

= -3.6x + 6 - 4 + 4.6x + 1.2x - 6= 1.8x - 4

1.8*(-7) - 4 = -17.6

5)х=7

-3(1,2х - 2) – (4 – 4,6x) + 6(0,2x – 1) = (-31.2)x + 32 - 4 + 4.6x + (6*0.2)*x - 6

= -3.6x + 6 - 4 + 4.6x + 1.2x - 6= 1.8x - 4

1.8*7 - 4 = 8.6

6) х=44

Почнемо спрощення виразу:

-3(1,2х - 2) – (4 – 4,6x) + 6(0,2x – 1) = (-31.2)x + 32 - 4 + 4.6x + (6*0.2)*x - 6

= -3.6x + 6 - 4 + 4.6x + 1.2x - 6 = 1.8x - 4

1.8*44 - 4 = 76.2

7) х=-44

-3(1,2x - 2) – (4 – 4,6x) + 6(0,2x – 1) = -3(1,2(-44) - 2) - (4 - 4,6(-44)) + 6(0,2(-44) - 1) = -3(-52,4) - (4 + 202.4) + 6(-9,2)= 157,2 - 206,4 - 55,2=-104,4