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(1)
7
9
+2
2
9
=______;
(2)12-7
1
8
=______.
(1)
7
9
+2
2
9

=
7
9
+
2
9
+2,
=3;

(2)12-7
1
8

=12-7-
1
8
,
=5-
1
8
,
=4
7
8
,
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