Ответы и объяснения

2013-02-07T23:03:33+04:00

1) 5/6-(3/10+2×2/5)=5/6-(3/10+4/10)=5/6-7/10=5×10/6-7×6/10=50/60-42/60=8/60=2/15

2) 3×4/4+1×2/8-5/16=12/16+2/16-5/16=9/16

2013-02-07T23:20:57+04:00

1)  5/6-(3/10+2×2/5)= 5/6-(3/10+4/10)= 5/6-7/10= 5×10/6-7×6/10= 50/60-42/60=8/60=2/15

2)  3×4/4+1×2/8-5/16= 12/16+2/16-5/16= 9/16