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2014-09-29T22:40:27+03:00
[0,8 + 2,1 : ( 1 -  - 0,1 ) • 5 ] : 15,8 - 2 =
[8/10+21/10:(1-1/5-1/10)
·5]:158/10-2=
[8/10+21/10:(10/10-2/10-1/10)·5]:158/10-2=
[8/10+21/10:7/10·5]:158/10-2=
[8/10+21/10·10/7·5/1]:158/10-2=  simplificam
[8/10+15/1]:158/10-2=
[8/10+150/10]:158/10-2=
158/10·10/158-2=1-2=-1

2 5 2