Question

Determină numerele a,b,c,știind că:
a+b=700
b+c=500
a+c=800

Answer 1

a+b=700=>a=700-b
b+c=500
a+c=800

b+c=500
700-b+c=800=>c-b=100

c+b=500
c-b=100
Adunam relatiile
2c=600=>c=300
c+b=500=>b=200
a=700-b=500

a=500
b=200
c=300

Answer 2

a+b=700
b+c=500
a+c=800

2a+2b+2c=700+500+800
2(a+b+c)=2000
a+b+c=2000:2
a+b+c=1000

c=1000-700
c=300

b=500-300
b=200

a=700-200
a=500

Proba :
500+200=700
200+300=500
500+300=800

Sper ca te-am ajutat.