Question

Aflați cifrele a,b,c,d știind că a5c9=3•1000+b•100+7•10+d

Answer 1

$\overline{a5c9}=3\cdot1000+b\cdot100+7\cdot10+d=\overline{3b7d}$
de unde rezulta ca:
d=9
c=7
b=5
a=3

Answer 2

⁻⁻$a5c9=3*1000+b*100+7*10+d \\ a=3*1000=3000 \\ b=5*100=500 \\ c=7*10=70 \\ d=9 \\ a5c9=3579$