Question

Scrieti numerele abab cu bara deasupra ,daca ab-ba cu bara deasupra= a+3b

Answer 1

__ __
ab-ba=a+3b
10a+b-(10b+a)=a+3b
10a+b-10b-a=a+3b
9a+(-9b)=a+3b
9a-9b=a+3b
9a-a=3b+9b
8a=12b |:4
2a=3b=>a=3 si b=2
sau
a=6 si b=4
sau
a=9 si b=6
____
=>abab€{3232,6464,9696}