Răspuns:
1. a=15 b=10
2. A=12 B=13 C=14
Explicație pas cu pas:
1. a+b=25
a-b=5
+ ----------------
a+b+a-b=25+5=30
2a= 30
a=30:2
a=15
15+b=25
b=25-15
b=10
PROBA:
15+10= 25
15-10=5
2. A+B+C= 39
A= 1 segment
B= 1 segment +1
C= 1 segment +2
39-3=36
3 segmente= 36
1 segment= 12
A=12
B=13
C=14
Succes
