8.
A |___|
B.|___|___| +72
615-72==534
543:3=181 (a)
B=2xa +72
B=2x181+72
B=362+72=434
17.
A |___| +32,80 kg
B |___|
158-32,80= 125,2 kg
B =125,2: 2
B=62,6 kg
A=62,6+32,80
A=95,4 kg
Verificare : 62,6+95,4=158 kg
18.
A |___|
B |___| + 16 M
104-16=88 M
A =88:2=44 M cablu pt prima clădire
B =44+16=60 M cablu pt a doua clădire
19.
A-2/3=7
A= 7+2/3 amplificam cu 3 pe 7
A=21/3+2/3=23/3
Succes
