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2014-08-04T15:58:14+03:00
A+b=300
b+c=500
a+c=400

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

2(a+b+c)=1200

a+b+c=600

c=600-300
c=300

a=600-500
a=100

b=600-400
b=200
18 4 18
2014-08-04T16:17:07+03:00
2×a+2×b+2×c=300+500+400=1200
a+b+c=1200:2=600
c=600-300=300
a=600-500=100
b=600-400=200
10 4 10