№1487
1)27.3:3.5=7.8кг-масса 1 дм3
2)10.92:7.8=1.4 дм3-объём 2 детали.
№1489(в,г)
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
5.6z-2z-0.7z+2.65=7
2.9z=7-2.65
2.9z=4.35
z=4.35:2.9
z=1.5
№1457(б)
5.453:0.01=545.3
25.43:0.01=2543
0.84:0.01=84
0.006:0.001=6
4:0.01=400