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2014-10-05T13:51:49+03:00
[(-2/5+1/2-1/3):7/15]³+1/8=[(-2·6/30+1·15/30-1·10/30):7/15]³+1/8=(-7/30:7/15)³+1/8=(-7/30·15/7)³+1/8=(-1/2)³+1/8=-1/8+1/8=0
2 5 2