4.2*(0.8+у)=8.82
3.36+4.2у=8.82
4.2у=8.82-3.36
4.2у=5.46
у=5.46:4.2
у=1.3
ОТВЕТ: 1.3
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
ОТВЕТ: 0.4
4.2*(0.8+у)=8.82
3.36+4.2у=8.82
4.2у=8.82-3.36
4.2у=5.46
у=5.46:4.2
у=1.3
ОТВЕТ: 1.3
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
ОТВЕТ: 0.4