Question

aflati numerele a,b,c, stiind ca a+b=117,a+c=219,b+c=203

Answer 1

a+b = 117 ⇒ b= 117-a
a+c = 219 ⇒ c = 219-a
inlocuim in
b+c = 203
117-a +219-a=203
-2a=203-117-219
-2a=-133
a=133/2= 66,5
b=117-66,5
c=219-66,5

Answer 2

a+b=117
a+c=219
b+c=203
adunam cele 3 relatii
2×a + 2×b +2×c = 117 + 219+203
2×(a+b+c) = 539
a+b+c = 539 : 2 = 269,5
c = 269,5 - 117 = 152,5
b = 269,5 - 219 = 50,5
a = 269,5 - 203 = 66,5

Verificare:
66,5 + 50,5 + 152,5 = 269,5