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b) 3,6 - 1 1/2 = 3,6 - 1,5 = 2,1
c) 2 1/3 : 0,8 = 7/3 : 8/10 = 7/3 * 10/8 = 70/24 = 2 22/24 = 2 11/12
d) 5,2 * 2/7 = 52/10 * 2/7 = 104/70 = 1 34/70 = 1 17/35
e) 0,6 : 2/3 = 6/10 : 2/3 = 6/10 * 3/2 = 18/20 = 9/10
f) 2 3/20 + 1,27 = 2,15 + 1,127 = 3,42