Răspuns :
a=? b=? a+b=76+9⇒a+b=85 a-b=9
a+b=85⇒a=85-b a-b=9 acum inlocuim⇒85-b-b=9⇒85-2b=9⇒2b=85-9⇒2b=76
⇒b=76÷2⇒b=38
a+b=85⇒a+38=85⇒a=85-38⇒a=47
facem verificarea: a+b=85⇒47+38=85
a-b=9 ⇒47-38= 9
a+b=85⇒a=85-b a-b=9 acum inlocuim⇒85-b-b=9⇒85-2b=9⇒2b=85-9⇒2b=76
⇒b=76÷2⇒b=38
a+b=85⇒a+38=85⇒a=85-38⇒a=47
facem verificarea: a+b=85⇒47+38=85
a-b=9 ⇒47-38= 9