Răspunsuri

2014-10-20T15:40:07+03:00
D=15x3-20x2              a+b-c=77
d=45-40
d=5
dxa+dxb-dxc
d(a+b-c)
5X77=385
2014-10-20T15:43:34+03:00
a+b-c = 77
d = 15×3-20×2 = 5

d×a + d×b - d×c = d ( a+b-c ) = 5 × 77 = 385