1)2.136:(1.9-х)=7.12
1.9-х=2.136:7.12
1.9-х=0.3
х=1.9-0.3
х=1.6
2)0.2t+1.7t-0.54=0.22
1.9t=0.22+0.54
1.9t=0.76
t=0.76:1.9
t=0.4
2,136:(1,9-x)=7,12
1,9-x=2,136:7,12
1,9-x=0,3
x=1,9-0,3
x=1,6
0,2t+1,7t-0,54=0,22
1,9t-0,54=0,22
1,9t=0,22+0,54
1,9t=0,76
t=0,76:1,9
t=0,4
