Calculează:
2.3
15
73
a)
-+-=
+1=
=+==
20 15
7
4
7 7
99
55
-+- =
11
19
10 10
=
100
100
100 100
14 12
13 5
27 11
24 9
=
33 17
13
4
b)
55
7 7
=
10 10
=
10 10
100 100
100
100
215
7
3 6
29
5
3
c) +1+
+
=
+
999
10
10 10
100 100 100
d) 1+
56
=
213
+1=
1+
30
=
1-==
10
23
75
18
-1=
1=
5
7