Question

Afla a,b,c stiind ca a+b=700,b+c=500,a+c=800

Answer 1

2a+2b+2c=700+500+800
2a+2b+2c=2000
a+b+c=2000:2
a+b+c=1000
a=1000-500
a=500
b=700-500
b=200
c=800-500
c=300
deci:a=500
       b=200
       c=300
v:500+200+300=1000
500+200=700
200+300=500
500+300=800
stiu ca este corect deoarece am avut si noi aceasta problema
sper ca te-am ajutat
succes 

Answer 2

a+b=700 -
b+c=500
_______
a-c=200=>a=200+c
a+c=800
2c+200=800
2c=600
c=300
a=500
b=200