Răspunsuri

2014-11-03T00:12:47+02:00
(a+b)x3+(a+c)×2=3a+3b+2a+2c=5a+3b+2c 33×3+11×2=99+22=121
Iar , a+b=20 si b+c =30 cat da 3×a+7×b+4×c ?