[r]
(1)+
9
5
4
1
(2)(3)9 + = 14
5 + =
14
?
9
5
+
(4)18
17
16
15
14
13
12
11
2
9 +
=
3
9 +
=
4
9 +
=
5
9 +
=
6
9 +
=
7
9 +
=
8
9 +
=
9
(5)2
9
+
=
11
3
9
+
=
12
4
9
+
=
13
5
9
+
=
14
6
9
+
=
15
7
9
+
=
16
8
9
+
=
17
9
(6)9
+
=
11
9
+
=
12
9
+
=
13
9
+
=
14
9
+
=
15
9
+
=
16
9
+
=
17
(7)2
9
+
=
9
+
=
12
4
9
+
=
5
+
=
14
6
9
+
=
9
+
=
16
8
+
=
17
9
(8)(9)
9 + 3
=
9 + 6
=
9 + 8
=
3 + 9
=
6 + 9
=
8 + 9
=
9+ 7
=
9 + 4
=
7+ 9
=
4 + 9
=
12
12
12
12
15
15
15
15
17
17
16
16
16
16
13
13
13
13
Bµi 1:TÝnh nhÈm:
17
(10)17
11
18
16
Bµi 2: TÝnh:
(11)Bµi 3:TÝnh:
9 + + = + + =
+ + = + + =