Question

Помогите пожалуйста

Answer 1

Ответ:

а)

$4(3 - x) - 11 = 7(2x - 5) \\ 12 - 4x - 11 = 14x - 35 \\ - 4x - 14x = - 35 - 12 + 11 \\ - 18x = - 36 \\ x = - 36 \div - 18 \\ x = 2$

б)

$0.9(4x - 2) = 0.5(3x - 4) + 4.4 \\ 3.6x - 1.8 = 1.5x - 2 + 4.4 \\ 3.6x - 1.5x = - 2 + 4.4 + 1.8 \\ 2.1x = 4.2 \\ x = 4.2 \div 2.1 \\ x = 2$

в)

$\frac{1.4x - 3.5}{0.5} = \frac{2.3x - 9}{ - 1.5} \\ 0.5(2.3x - 9) = - 1.5(1.4x - 3.5) \\ 1.15x - 4.5 = - 2.1x + 5.25 \\ 1.15x + 2.1 x = 5.25 + 4.5 \\ 3.25x = 9.75 \\ x = 9.75 \div 3.25 \\ x = 3$

Answer 2

Объяснение:

а) 4(3-х)-11=7(2х-5)

12-4х-11=14х-35

-18х=-36

х=36/18

х=2

б) 0,9(4х-2)=0,5(3х-4)+4,4

3,6х-1,8=1,5х-2+4,4

2,1х=4,2

х=4,2/2,1

х=2

в) (1,4х-3,5)/0,5=(2,3х-9)/-1,5

3(1,4х-3,5)/1,5+(2,3х-8)/1,5=0

(4,2х-10,5+2,3х-8)/1,5=0

(6,5х-18,5)/1,5=0 |•1,5

6,5х-18,5=0

6,5х=18,5

х=18,5/6,5

х=39/13

х=3