Răspuns :
a+b+c=869
a=29+b
c=3b
29+b+b+3b=869
29+5b=869
5b=869-29
5b=840
b=840:5
b=168
a=29+168=197
c=3•168=504
Verificare:
197+168+504=
365+504=
869
a=29+b
c=3b
29+b+b+3b=869
29+5b=869
5b=869-29
5b=840
b=840:5
b=168
a=29+168=197
c=3•168=504
Verificare:
197+168+504=
365+504=
869