Question

afla numerele a b si c stiind ca a+b=300 b+c=500 iar a+c =400

Answer 1

2a+2b+2c=1200

a+b+c=600

a+b=300

300+c=600

c=600-300

c=300

b+c=500

b=500-300=200

a+c=400

a=400-300

a=100

si faci verificarea

a+b=300

100+200=300

si tot asa

100+200+300=600

sper ca ai inteles

Answer 2

2a+2b+2c=300+500+400

                =1200

a+b+c=1200:2=600

a+b=300  c=600-300=300  c=300

b+c=500  a=600-500=100  a=100

a+c=400  b=600-400=200  b=200