Răspuns :
a5c9=3x1000+bx100+7x10+d
1000xa +5x100+cx10+9=3x1000+bx100+7x10+d
1000xa=3x1000
a=3
5x100=bx100
b=5
cx10=7x10
c=7
d=9
1000xa +5x100+cx10+9=3x1000+bx100+7x10+d
1000xa=3x1000
a=3
5x100=bx100
b=5
cx10=7x10
c=7
d=9
____
a5c9 = 3 * 1000 + b * 100 + 7 * 10 + d
____ ____
a5c9 = 3b7d
=>
a = 3
b = 5
c = 7
d = 9
Numarul este: 3579
a5c9 = 3 * 1000 + b * 100 + 7 * 10 + d
____ ____
a5c9 = 3b7d
=>
a = 3
b = 5
c = 7
d = 9
Numarul este: 3579