Răspuns :
a*(b+5)=336
a*b=301
a*(b+5)=336
a*b+5a=336
301+5a=336
5a=336-301
5a=35 |:5
a=7
Coroana?
a*b=301
a*(b+5)=336
a*b+5a=336
301+5a=336
5a=336-301
5a=35 |:5
a=7
Coroana?
a×(b+5)=336
a×b=301
=>a*b+a*5=336
301+a*5=336
5a=336-301
5a=35
a=35:5
a=7
Proba:301+7*5=336
301+35=336
336=336
a×b=301
=>a*b+a*5=336
301+a*5=336
5a=336-301
5a=35
a=35:5
a=7
Proba:301+7*5=336
301+35=336
336=336