решить дроби : 1 5/6* 8 2/11* 4/9
(1013 *11/12)*(12/55*13/20)
15/19*(19/25*7/9)*5/7
(1013 *11/12)*(12/55*13/20)
15/19*(19/25*7/9)*5/7
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1)5/6*8 2/11=5/6*90/11=5/1*15/11=75/11=6 9/11
2)6 9/11*4/9=75/11*4/9=25/11*4/3=100/33=3 1/33
(10/13*11/12)*(12/55*13/20)=1/10
1)10/13*11/12=110/156=55/78
2)12/55*13/20=3/55*13/5=39/275
3) 55/78*39/275=1/2*1/5=1/10
15/19*(19/25*7/9)*5/7=1/3
1)19/25*7/9=133/225
2)15/19*133/225=1/1*7/15=7/15
3)7/15*5/7=1/3*1/1=1/3