Question

2) Решить уравнения:
7x + 1 = 15
25x - 52 =23
6x +11 = 2x - 5
10 +22,7x = 4,7x +28
8,2 - 3x = 11,7 + 2x
5 – (x-2) = 4x +17
10x + 2,5 = 12 – (10x – 10,5)
87 – 2x = 2(4x+56)
3(x + 1 ) + 11 = 34 – 2x
4 + 5(2x+1) = 39
2x + 8 + x = 13 – x + 19
-12(2 – x) = 6x + 48
35 – 7(5 - x) = x + 12
49x = 270 – (x + 20)
-11x +52 = 46x – (48+ 37x)
7,2x – 6 = 2,2x + 14
3,6 – 1,2x =1,4x – 1,6
1,5 + 5,2x = (4,8x – 1) – 6,7
850 – 225x = 400
159x – 21,87 = 84x + 278,13
Даю 20 баллов

Answer 1

Пошаговое объяснение:

7х+1=15

7х=15-1

7х=14

х=14÷7

х=2

25х-52=23

25х=23+52

25х=75

х=75÷25

х=3

6х+11=2х-5

6х-2х=-5-11

4х=-16

х=-16÷4

х=-4

10+22,7х=4,7х+28

22,7х-4,7х=28-10

18х=18

х=18÷18

х=1

8,2-3х=11,7+2х

-3х-2х=11,7-8,2

-5х=3,5

х=3,5÷(-5)

х=-0,7

5 – (x-2) = 4x +17

5-х+2=4х+17

7-х=4х+17

-х-4х=17-7

-5х=10

Х=10÷(-5)

Х=-2

10x + 2,5 = 12 – (10x – 10,5)

10х+2,5=12-10х-10,5

10х+2,5=1,5-10х

10х+10х=1,5-2,5

20х=-1

Х=-1÷20

Х=-0,05

87 – 2x = 2(4x+56)

87-2х=8х+112

-2х-8х=112-87

-10х=25

Х=25÷(-10)

Х=-2,5

3(x + 1 ) + 11 = 34 – 2x

3х+3+11=34-2х

3х+14=34-2х

3х+2х=34-14

5х=30

Х=30÷5

Х=6

4 + 5(2x+1) = 39

4+10х+5=39

9+10х=39

10х=39-9

10х=30

Х=30÷10

Х=3

2x + 8 + x = 13 – x + 19

3х+8=32-х

3х+х=32-8

4х=24

Х=24÷4

Х=6

-12(2 – x) = 6x + 48

-24+12х=6х+48

12х-6х=48+24

6х=72

Х=72÷6

Х=12

35 – 7(5 - x) = x + 12

35-35+7х=х+12

7х=х+12

7х-х=12

6х=12

Х=12÷6

Х=2

49x = 270 – (x + 20)

49х=270-х-20

49х=250-х

49х+х=250

50х=250

Х=250÷50

Х=5

-11x +52 = 46x – (48+ 37x)

-11х+52=46х-48-37х

-11х+52=9х-48

-11х-9х=-48-52

-20х=-100

Х=-100÷(-20)

Х=5

7,2x – 6 = 2,2x + 14

7,2х-2,2х=14+6

5х=20

Х=20÷5

Х=4

3,6 – 1,2x =1,4x – 1,6

-1,2х-1,4х=-1,6-3,6

-2,6х=-5,2

Х=-5,2÷(-2,6)

Х=2

1,5 + 5,2x = 4,8x – 1 – 6,7

1,5+5,2х=4,8х-7,7

5,2х-4,8х=-7,7-1,5

0,4х=-9,2

Х=-9,2÷0,4

Х=-23

850 – 225x = 400

-225х=400-850

-225х=-450

Х=-450÷(-225)

Х=2

159x – 21,87 = 84x + 278,13

159х-84х=278,13+21,87

75х=300

Х=300÷75

Х=4