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2014-08-08T12:26:01+03:00
1/2+ 2/3 * 9/4= 1/2 + 3/2= 4/2=2

12,9+12,6= 25,5

1/12 +4/5 : -(7-1)/21=  1/12 +4/5 : (- 6/21)=

=1/12 +4/5 : (-2/7)=

=1/12 + 4/5 * (-7/2)=

=1/12 - 14/5=

= (5- 168)/60=  -163/60=  -51/20
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