Oblicz :
a) 1 cala 3/4 + 2 cale 1/2
3 cale 2/9 + 1 cala 2/3
4 cale 4/5 + 1 cala 3/4 +4/5
b) 4/5 + 3/4 + 2/5
5/7 + 1/2 + 6/7
2/8 + 1/3 + 5/8
c) 1 cala 5/6 + 2 cale 2/3 + 1 cala 4/9
1 cala 3/8 + 2 cale 1/3 + 1 ca;a 5/6
2 cale 7/10 + 1 cala 3/4 + 4/5
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a) 1 cala 3/4 + 2 cale 1/2=
1i 3/4 + 2 i 2/4=
3 i 5/4 =
4 i 1/4
3 cale 2/9 + 1 cala 2/3=
3i 2/9 + 1 i 6/9 =
4 i 8/9
4 cale 4/5 + 1 cala 3/4 +4/5=
4 i 16/20 + 1 i 15/20 + 16/20 =
5 i 47/20 =
7 i 7/20
b)4/5 + 3/4 + 2/5 =
16/20 + 15/20 + 8/20 =
39/20=
1 i 19/20
5/7 + 1/2 + 6/7 =
10/14 + 7/14 + 12/14 =
29/14 =
2 i 1/14
2/8 + 1/3 + 5/8 =
6/24 + 8/24 + 15/24 =
29/24 =
1 i 5/24
c) 1 cala 5/6 + 2 cale 2/3 + 1 cala 4/9
1 i 15/18 + 2 i 12/18 + 1 i 8/18 =
4 i 35/18 =
5 i 17/18
1 cala 3/8 + 2 cale 1/3 + 1 ca;a 5/6 =
1 i 9/24 + 2 i 8/24 + 1 i 20/24 =
4 i 37/24 =
5 i 13/24
2 cale 7/10 + 1 cala 3/4 + 4/5 =
2 i 14/20 + 1 i 15/20 + 16/20 =
3 i 45/20 =
5 i 5/20 =
5 i 1/4
sprowadzamy do wspólnego mianownika
a) 4 całe 1/4
4 całe 8/9
6 całę 2/20