Răspunsuri

2014-05-07T15:03:42+03:00
A, b, c - laturi
a+b+c=21

a+b=12=> a=12-b
b+c=16=> c=16-b

12-b+b+16-b=21
12+16-21=b+b-b
b=7

a=12-7
a=5

c=16-7
c=9
1 1 1