(共16张PPT)
+ =
7
1
8
+ = 9
8
1
1
9 － =
8
+ = 9
7
2
2
9 － =
7
+ = 9
6
3
3
9 － =
6
+ = 9
4
5
4
9 － =
5
填一填
3
5
2
7
2
8
5
9
8
9
6
4
+
=
3
5
8
+
=
5
3
8
-
=
8
3
5
-
=
8
5
3
+
=
7
2
9
-
=
9
7
2
+
=
2
7
9
-
=
9
2
7
棵
+
=
4
5
9
+
=
5
2
7
朵
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