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= 7 3/12 - 2 6/12 - 3 10/12 + 2 4/12 =
= 9 7/12 - 5 16/12 =
= 9 7/12 - 6 4/12 = 3 3/12 = 3 1/4
b) 4 1/5 - 2 3/4 + 1 1/8 - 2 7/10 =
= 4 8/40 - 2 30/40 + 1 5/40 - 2 28/40 =
= 5 13/40 - 4 58/40 =
= 5 13/40 - 5 18/40 = - 5/40 = - 1/8
c) 3 7/12 - 1 3/5 - 1 11/20 + 1 5/6 =
= 3 35/60 - 1 36/60 - 1 33/60 + 1 50/60 =
= 4 85/60 - 2 69/60 = 2 16/60 = 2 4/15
d) 8 5/36 -3 7/9 - 2 1/8 - 1 7/18 =
= 8 10/72 - 3 56/72 - 2 9/72 - 1 28/72 =
= 8 10/72 - 6 93/72 =
= 8 10 /72 - 7 21/72 =
= 7 82/72 - 7 21/72 = 61/72