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b) 5 1/5 - 3/5 : 2/15 = 5 1/5 - 9/2 = 26/5 - 9/2 = 52 /10 - 45/10 = 7/10
c) 2 1/5 : 11/20 + 3/4 : 1 2/3 = 11/5 : 11/20 + 3/4 : 5/3 = 20/5 + 9/20 = 4 9/20
d) 4 1/5 : 5/6 - 1 1/5 * 1 2/3 = 21 /5 : 5/6 - 6/5 * 5/3 = 126/25 - 30/15 = 5 1/25 - 2 = 3 1/25