oblicz w pamięci:
a)3/6 + 2/6 =
b)1 i 5/8 + 2 i 3/8
c)6-2/7
d)1/4 - 1/8
e)6 i 1/2 - 1 i 1/4
f)5 - 3 i 3/7
prosze o pomoc :(
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b).1 i 5/8 + 2 i 3/8 = 3 i 8/8 = 4
c).6 - 2/7 = 5 i 7/7 - 2/7 = 5 i 5/7
d).1/4 - 1/8 = 2/8 - 1/8 = 1/8
e).6 i 1/2 - 1 i 1/4 = 6 i 2/4 - 1 i 1/4 = 5 i 1/4
f).5 - 3 i 3/7 = 4 i 7/7 - 3 i 3/7 = 1 i 4/7