Решите пж, подробно, расписанно

202

1.2х=18-х

2х+х=18

3х=18

х=6

2.7х+3=30-2х

7х+2х=30-3

9х=27

х=3

3.7-2х=3х-18

-2х-3х=-18-7

-5х=-25

х=5

4. 0.2х+2.7=1.4-1.1х

0.2х+1.1х=1.4-2.7

1.3х=-1.3

х=-1

5. 5.4-1.5х=0.3х-3.6

-1.5х-0.3х=-3.6-5.4

-1.8х=-9

х=0.5

203

1. 3 (х-2)=х+2

3х-6=х+2

3х-х=2+6

2х=8

х=4

2. 5-2 (х-1)=4-х

5-2х+2=4-х

-2х+х=4-5-2

-х=-3

х=3

3. (7х+1)-(9х+3)=5

7х+1-9х-3=5

7х-9х=5-1+3

-2х=7

х=-3.5

4.3.4+2у=7(у-2.3)

3.4+2у=7у-16.1

2у-7у=-16.1-3.4

-5у=-19.5

у=3.9

5.0.2(7-2у)=2.3-0.3(у-6)

1.4-0.4у=2.3-0.3у+1.8

-0.4у+0.3у=2.3+1.8-1.4

0.1у=3.7

у=37

202.

4 (5х+2)=10 (2х-3)+15

20х+8=20х-30+15

20х-20х=-30+15-8

ОТВЕТ 0

2 (7х-7)=7 (2х-3)+7

14х-14=14х-21+7

14х-14х=-21+7+14

ОТВЕТ 0