Question

afla nemerele a,b şi c stiind ca a+b =300,b+c=500,iar a+c=400

Answer 1

a+b=300
b+c=500      b=500-c
a+c=400     a=400-c
400-c+500-c=300
-2c=300-900
c=600:2
c=300
b=500-300=200
a=400-300=100

Answer 2

a+b=300 b+c=500 a+c=400 500-400=100 a 100+b=300. b=300-100=200 100+c=400. c=400-100=300