Răspunsuri

2014-05-25T11:14:17+03:00
A+b=7
a+c=8

a+b+c=12
c=12-7
c=5

a=8-5
a=3

b=7-3
b=4
2014-05-25T11:16:46+03:00

7+8=15

15-12=3 MERE ARE ANA