Răspuns :
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
aflam pe c
700+c=1000
c=1000-700
c=300
aflam pe a
a+500=1000
a=1000-500
a=500
aflam pe b
500+b+300=1000
b=1000-500-300
b=200
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
aflam pe c
700+c=1000
c=1000-700
c=300
aflam pe a
a+500=1000
a=1000-500
a=500
aflam pe b
500+b+300=1000
b=1000-500-300
b=200
a+b=700
b+c=500
a+c=800
+
2a+2b+2c=700+500+800=2000
2(a+b+c)=2000 /÷2
⇒a+b+c=1000
b+c=500
a+c=800
+
2a+2b+2c=700+500+800=2000
2(a+b+c)=2000 /÷2
⇒a+b+c=1000