Răspuns :
a + b = 100
a - b = 28
facem sistem si vine 2a=128
a= 128 : 2
a = 64
b = 100-64
b= 36
a - b = 28
facem sistem si vine 2a=128
a= 128 : 2
a = 64
b = 100-64
b= 36
a+b=100
a-b=28 ⇒ a=b+28
b+28+b=100
2b=100-28=72
b=72:2
b=36
a=36+28
a=64
V: 64+36=100
64-36=28
a-b=28 ⇒ a=b+28
b+28+b=100
2b=100-28=72
b=72:2
b=36
a=36+28
a=64
V: 64+36=100
64-36=28