Trzeba sprowadzić do wspólnego mianownika
a)1/4 + 1/5 = 5/20 + 4/20 = 9/20
b)2/3 + 5/7 = 14/21 + 15/21 = 29/21= 1 8/21
c)1 1/10 + 5 4/5 = 1 1/10 + 5 8/10 = 6 9/10
d)5/6 + 3 11/12 = 10/12 + 3 11/12 =3 21/12 = 4 9/12 = 4 1/4
e)1/4 + 1/5 + 3/10 = 5/20 + 4/20 + 6/20 = 15/20 = 3/4
f)5 + 7 8/9 + 1/2 = 5 + 7 32/36 + 18/36 = 12 50/36 = 13 14/36
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Trzeba sprowadzić do wspólnego mianownika
a)1/4 + 1/5 = 5/20 + 4/20 = 9/20
b)2/3 + 5/7 = 14/21 + 15/21 = 29/21= 1 8/21
c)1 1/10 + 5 4/5 = 1 1/10 + 5 8/10 = 6 9/10
d)5/6 + 3 11/12 = 10/12 + 3 11/12 =3 21/12 = 4 9/12 = 4 1/4
e)1/4 + 1/5 + 3/10 = 5/20 + 4/20 + 6/20 = 15/20 = 3/4
f)5 + 7 8/9 + 1/2 = 5 + 7 32/36 + 18/36 = 12 50/36 = 13 14/36