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2014-10-18T19:14:53+03:00
3/4AC=9
AC=36:3      AC=12
AM=MB
BC=AC-AB=12-9=3
MN=MB+BN
MB=AB/2=9/2=4,5
BN=BC/2=3/2=1,5
MN=4,5+1,5=6
4 4 4