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b) 4 6/7 - 2 1/2 = 4 30/35 - 2 7/35 = 2 23/35
c) 8 2/9 - 3 5/6 = 8 4/18 - 3 15/18 = 7 22/18 - 3 15/18 = 4 7/18
d) 7/15 *3/4 = 7/20
e) 4/7 : 8/21= 4/7 * 21/8= 3/2 = 1 1/2
f) 2 2/3 * 1 3/4 = 8/3 *7/4 = 14/3 = 4 2/3