repede multumesc ex 3

Răspuns:
Explicație pas cu pas:
a+b+c=200
a+b=4c (1)
a-b=2c (2)
(1)+(2) ->>a+b+a-b=4c+2c ->>>2a=6c->>a=3c
(1)-(2)->>>a+b-a+b=4c-2c->>>2b=2c->>b=c
a+b+c=200 ->>>Dar a+b=4c->>>4c+c=200-->>5c=200->>c=40
a=3c->>a=120 , b=c->>b=40
Deci a=120,b=c=40