Răspuns :
129 + 1562 - 5f = 171
1691 - 5f = 171
5f = 1691 - 171
5f = 1520
f = 1520 : 5
f = 304
1691 - 5f = 171
5f = 1691 - 171
5f = 1520
f = 1520 : 5
f = 304
129+11x142-5xf=171
=129 +1562-5xf=171
1691-5xf=171
1691-171
1520
f=1520:5
F=304
VERIFICARE:
129+11x142-5X304=171
304x5=1520
11x142 1562 =129+1562-1520=171
=129 +1562-5xf=171
1691-5xf=171
1691-171
1520
f=1520:5
F=304
VERIFICARE:
129+11x142-5X304=171
304x5=1520
11x142 1562 =129+1562-1520=171