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2014-10-08T22:56:37+03:00
(-8/5)+2/3x(-9/4)=-8/5-18/12=(-8·12-18·5)/60=(-96-90)/60=-186/60 simplificam=-31/10=-3,1

(-9/13)x[-0,(39)]x(-20/21)
0,39=39/99 simplif.=13/33
=(-9/13)·(-13/33)·(-20/21) simplificam=3/11·(-20/21) simplificam=-20/77
--4/-5x (-3/16+1)=4/5·(-3/16+16/16)=4/5·13/16 simplificam=13/20