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+1 5/6=119/60-31/20+1 5/6=13/30+11/6=34/15=2 4/15
2) 8 5/36 - 3 7/9 - 2 1/8 - 1 7/18 =293/36-34/9-2 1/8-1 7/18=157/36-17/8-1 7/18=
=161/72-25/18=61/72
3) 4 1/2 - ( 5 3/7 - 1 3/14 ) =9/2-(38/7-17/14)=9/2-59/14=2/7
4) 2 1/8 - ( 1 2/7 - 3 1/28 ) =17/8-(9/7-85/28)=17/8-(-7/4)=17/8+7/4=31/8=3 7/8
2) 8 5/36 - 3 7/9 - 2 1/8 - 1 7/18 = 8 10/72 - 3 56/72 - 2 9/72 - 1 28/72=61/72
3) 4 1/2 - ( 5 3/7 - 1 3/14 ) = 4 7/14 -(5 6/14 - 1 3/14) = 4 7/14 - 4 3/14 = 4/14 = 2/7
4) 2 1/8 - ( 1 2/7 - 3 1/28 ) = 2 7/56 - (1 16/56 - 3 2/56) = 2 7/56 - (-2 14/56) =
=2 7/56 + 2 14/56 = 4 21/56 = 4 3/8