計(jì)算
2
2
9
-(
2
9
+
m2
)=
m
+
3
7
+
4
=
7
9
-
2
3
+
m
3
=
m-
m
6
-
6
=
(o)2
2
9
-(
2
9
+
5
o2

=2
2
9
-
2
9
-
5
o2

=2-
5
o2

=o
7
o2
;

(2)
o
5
+
+
4
5

=
o
5
+
4
5
+

=o+

=o
;

(右)
9
-
2
+
o

=
2
9
+
o

=
5
9


(4)o-
o
6
-
5
6

=o-(
o
6
+
5
6

=o-o
=0.
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