Question

Daca a=5/6, b+c=7/20 si c-d =1/24, calculati a*b+2*a*c-a*d

Answer 1

a = 5/6    b + c = 7/20    c - d = 1/24    b + 2c - d = 7/20 + 1/24 = 42/120 + 5/120 = 49/120
ab +2ac - ad = a(b + 2c - d) = 5/6 · 49/120 = 49/144