Question

daca 3 a+2 b+4 c=494 si b+2 c=160, calculati a si ab+2 ac rog urgent dau coroana clasa5

Answer 1

*    3a + 2(b+2c=494   →   3a = 494 - 2*160   →   3a = 174   →   a = 58  ;
**   ab+2ac=a(b+2c) =58 * 160 =9280  ;