直接寫得數(shù).
1
4
+
3
4
=
5
7
-
5
7
=
③1-
3
5
=
④2+
7
8
=
1
4
+
3
4
=1
5
7
-
5
7
=0
③1-
3
5
=
2
5
④2+
7
8
=2
7
8
故答案為:1,0,
2
5
,2
7
8
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