Răspuns :
a+b+c=390
a-10=b-30=c-50
a=? , b=? , c=?
390-10-30-50=300
300/3=100
100+10=110(a)
100+30=130(b)
100+50=150(C)
a-10=b-30=c-50
a=? , b=? , c=?
390-10-30-50=300
300/3=100
100+10=110(a)
100+30=130(b)
100+50=150(C)
a+b+c=390
a -10 = b - 30 = c - 50
a -10 = b - 30 ⇒a - 10+ 30=b⇒b = a+20
a -10 = c - 50⇒c = a - 10 + 50⇒ c = a +40
inlocuim b si c in prima ecuatie a+b+c=390
a+ a +20 +a +40 = 390
3a + 60 = 390
a = 330:3 ⇒a = 110
b=a+20=110+20=130
c=a+40=110+40=150
deci a=110, b=130 si c=150
verificare
a+b+c=390 ⇒110+130+150=390
a -10 = b - 30 = c - 50
a -10 = b - 30 ⇒a - 10+ 30=b⇒b = a+20
a -10 = c - 50⇒c = a - 10 + 50⇒ c = a +40
inlocuim b si c in prima ecuatie a+b+c=390
a+ a +20 +a +40 = 390
3a + 60 = 390
a = 330:3 ⇒a = 110
b=a+20=110+20=130
c=a+40=110+40=150
deci a=110, b=130 si c=150
verificare
a+b+c=390 ⇒110+130+150=390