Răspunsuri

2014-05-15T17:38:59+03:00
c+c+c=9
3c=9
c=9:3
c=3

a-b-c=0
a-b-3=0
a-b=3
a=b+3

a+b-c=5
b+3+b-3=5
2b=5
b=5/2

a=5/2+3
a=5+6/2
a=11/2