Răspunsuri

2014-10-07T16:52:40+03:00
283+157-a=96-39
440-a=57
440-57=a
a=383

a +b+c=279;
a+b=184  a=184-b  a=184-39=145
b+c=134   c=134-b   c=134-39=95
inlocuim in pimul rand
184-b+b+134-b=279
318-b=279
318-279=b
39=b