Răspuns :
a+b=60
a-b= 34
---------------------
2a= 94
a= 94:2
a=47
47+b=60
b= 60-47
b=13
proba: 47+13=60
47-13=34
a-b= 34
---------------------
2a= 94
a= 94:2
a=47
47+b=60
b= 60-47
b=13
proba: 47+13=60
47-13=34
a + b = 60
a - b = 34 Le adunam
a + b + a - b = 60 + 34
2a = 94
a = 47
b = 60 - 47
b = 13
a - b = 34 Le adunam
a + b + a - b = 60 + 34
2a = 94
a = 47
b = 60 - 47
b = 13