Question

Aflati cifrele a,b,c,d,stiind ca a5c9=3x1000+bx100+7x10+d.

Answer 1

a = 3
b = 5
c = 7
d = 9
3 x 1000 + 5 x 100 + 7 x 10 + 9 = 3579

Answer 2

      
$\overline{a5c9}=3\cdot1000+b\cdot100+7\cdot10+d \\ \\ \overline{a5c9}=\overline{3b7d} \\ \\ \text{Numerele fiind egale, inseamna ca cifrele corespunzatoare: } \\ -unitatilor\;sunt\;egale =\ \textgreater \ \;\; d=9 \\ -zecilor\;sunt\;egale =\ \textgreater \ \;\; c=7\\ -sutelor\;sunt\;egale =\ \textgreater \ \;\; b=5\\ -miilor\;sunt\;egale =\ \textgreater \ \;\; a=3 \\ \\ Solutia \;este: \\ a=\boxed{3}\\ b=\boxed{5}\\ c=\boxed{7}\\ d=\boxed{9}$