1.Zastąp oba ułamki tak ,aby otrzymać ułamki o jednakowych mianownikach, i oblicz.
a)1/4 + 3/5 =
b)4/5 - 7/11 =
c)6/7 + 1/8 =
d) 1/5 - 1/9 =
2.Oblicz
a)2/3 + 1/4 =
b)3/4 + 3/5 =
c)1/4 + 2/7 =
d)2/3 + 1/8 =
e)1/4 + 1/6 =
f) 1/6 + 4/9 =
g) 3/8 + 7/10 =
h) 5/6 + 3/8 =
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a) 5/20 + 12/20 = 17/20
b) 44/55 - 35/55 = 9/55
c) 48/56 + 7/56 = 55/56
d) 9/45 - 5/45 = 4/45
2.
a) 8/12 + 3/12 = 11/12
b) 15/20 + 12/20 = 27/20 = 1 i 7/20
c) 7/28 + 8/28 = 15/28
d) 16/24 + 3/24 = 19/24
e) 3/12 + 2/12 = 5/12
f)6/36 + 16/36 = 22/36 = 11/18
g)15/40 + 28/40 = 43/40 = 1 i 3/40
h) 20/24 + 9/24 = 29/24 = 1 i 5/24