Question

Suma a trei nr.este 778.Suma primelor doua nr.este 580 ,iar suma ultimelor doua este 451 .Afla cele trei nr.

Answer 1

a, b, c - numerele căutate.

a + b + c = 778

a + b = 580

b + c = 451

~

a, b, c = ?

~

a + b + c = 778

580 + c = 778 /-580

c = 198.

b + c = 451

b + 198 = 451 /-198

b = 253.

a + b = 580

a + 253 = 580 /-253

a = 327.

/rs

Answer 2

a+b+c=778
a+b=580
b+c=451
580+c=778
c=778-580
c=198
b+198=451
b=451-198
b=253
a+253=580
a=580-253
a=327
327+253+198=778
a +b +c
SUCCES!!!