Răspuns :
[tex]a + b + c = 50\\a = b+4\\c = b+7\\\\b+4+b+b+7=50\\3b = 50 - 4 -7\\3b = 39 = > b = 13\\\\a = b +4 = 17\\c=b+7=20\\[/tex]
Sper ca am ajutat si spor la teme!
al doilea nr=x-4
al treilea nr=x+7
x+(x-4)+(x+7)=50
3x-4+7=50
3x+3=50
3x=50-3
3x=47
x=47÷3
x=15.67
al doilea nr=x-4=15.67-4=11.67
al treilea nr=x+7=15.67+7=22.67