Răspuns:
1. ab=4×2=8
2. 8/2=12/3
3. 2/4=1/2
4. 10x=10
x=1
5. 2b=3a
a+b=5|×3
3a+3b=5
2b+3b=5
5b=5
b=1
a+b=5
a=4
