Răspunsuri

2014-09-23T10:57:34+03:00
A - b = 5
a : b = 1/2
a = b/2
inlocuim in prima relatie
b/2 - b = 5
b - 2b = 10
b = - 10
a - (- 10 ) = 5
a + 10 = 5
a = 5 - 10
a = - 5
Verificare: - 5 - ( - 10) = 5
- 5 + 10 = 5
5 = 5