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3 i 6/9 - 1/9= 3 i 5/9
b) 5 i 3/10 - 2 i 2/10= 3 i 1/10
4 i 7/8 - 7/8= 4
c) 3 i 9/11 - 1 i 4/11= 2 i 5/11
3 i 13/15 - 1 i 7/15 = 2 i 6/15 = 2 i 2/5
3 całe 6/9 - 1/9= 3 i 5/9
b) 5 całych 3/10 - 2całe 2/10= 3 i 1/10
4 całe 7/8 - 7/8= 4
c) 3 całe 9/11 - 1 cała 4/11= 2 i 5/11
3 całe 13/15 - 1 cała 7/15 = 2 i 6/15