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2014-10-22T20:37:20+03:00
=15^12(3+2):15^11+[3²(1+1)]³:3³(1+1):3+1-1=
=15^(12-11)·5+3^(2·3)·2³:3³·2:3+0=
=15·5+3^6·2³:3³·2:3=
=3·5²+3^(6-3-1)·2^(3-1)=
=3·5²+3²·2²=3(5²+3·2²)=3(25+12)=3·27=81=3^4
6 3 6