Question

Решите уравнения заранее спасибо

Answer 1

5(х+2)=4(3-х)+7
5х+10=12-4х+7
5х+4х=12+7-10
9х=9
х=1

-3(5-2х)+4х=5(х-3)+27
-15+6х+4х=5х-15+27
 6х-5х=-15+27+15
  х=27

0.4(6х-7)=0.5(3х+7)
2.4х-2.8=1.5х+3.5
2.4х-1.5х=3.5+2.8
0.9х=6.3
х=7

7(1.4у+1.8)-27.6=10.1у
9.8у+12.6-27.6=10.1у
9.8у-10.1у=27.6-12.6
-0.3у=15
у=-50

3(5-х)+13=4(3х-8)
15-3х+13=12х-32
-3х-12х=-32-15-13
-15х=-60
х=4

0.7(6у-5)=0.4(у-3)-1.16
4.2у-3.5=0.4у-1.2-1.16
4.2у-0.4у=-1.2-1.16+3.5
3.8у=1.14
у=0.3