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
проверка:
0.2*0.4+1.7*0.4-0.54=0.22
0.22=0.22
5,6z-2z-0,7z+2,65=7
2.9z+2.65=7
2.9z=7-2.65
2.9z=4.35
z=4.35:2.9
z=1.5
5.6*1.5-2*1.5-0.7*1.5+2.65=7
7=7
в)0,2t+1,7t-0,54=1,9t-0,54
г)5,6z-2z-0,7z+2,65=2,9z +2,65
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
проверка:
0.2*0.4+1.7*0.4-0.54=0.22
0.22=0.22
5,6z-2z-0,7z+2,65=7
2.9z+2.65=7
2.9z=7-2.65
2.9z=4.35
z=4.35:2.9
z=1.5
проверка:
5.6*1.5-2*1.5-0.7*1.5+2.65=7
7=7
в)0,2t+1,7t-0,54=1,9t-0,54
г)5,6z-2z-0,7z+2,65=2,9z +2,65