Question

Determina nr a b c stiind ca:a+b=700 b+c=500 a+c=800

Answer 1

a+b=700
b+c=500
..................................
a+b+b+c=700+500
a+2*b+c=1200
a+c+2*b=1200
800+2*b=1200
800+m=1200
m=1200-800
m=400
2*b=400
b=400:2=200
a+b=700
a+200=700
a=700-200=500
a+c=800
500+c=800
c=800-500=300...