Question

Afla numerele a,b,c stiind ca : a+b=300 , a+c=200 , iar b+c=300

Answer 1

a+b=300
a+c=200
b+c=300
Adunam ecuatiile
2a+2b+2c=800
2(a+b+c)=800
a+b+c=400
300+c=400
c=100
b=300-100
b=200
a=200-100
a=100

Answer 2

Se aduna cele 3 relatii si se obtine: a+a+b+b+c+c=300+200+300 => 2a+2b+2c=800 => 2(a+b+c)=800=> a+b+c=400 
c=400-300=100
b=400-200=200
c=400-300=100