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b) 5/12 + 2/12 = 7/12
c) 8/5 + 5/2 = 16/10 + 25/10 = 41/10 = 4całe i 1/10
d) 7/2 - 7/4 = 14/4- 7/4 = 7/4 = 1cała i 3/4
e) 13/6 - 5/3 = 13/6 - 10/6= 3/6 = 1/2
f) 36/5 - 11/4 = 144/20 - 55/20 = 89/20 = 4całe i 9/20