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2014-06-18T18:28:32+03:00
A= 5/3 -3/7

b=1/3 +3/7

ma= (a+b)/2

ma=(5/3 -3/7 +1/3 +3/7) /2=

=(6/3 -3/7+3/7)/2=

= 6/3/2=
=2/2=1
2 3 2