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2014-10-01T20:40:29+03:00
A+b=120 b+c=230 a+2b+c=a+b+b+c=230+120=350 5a+8b+3c=5a+5b+3b+3c=5×(a+b)+3×(b+c)=5×120+3×230=600+690= 1290
2 5 2