Răspunsuri

Cel mai inteligent răspuns!
2014-10-15T20:16:24+03:00
(4a+c+4b) x [3c-(2a+2b)]=

a+b=4
c=5
______________
4(a+b)+5x[15-2(a+b)
4x4+5x(15-8)
16+5x7
=16+35
=51