题目内容

7
9
-
4
9
=______;
3
8
+
5
8
=______;
1
2
-
1
2
=______;
1
3
-
1
4
=______;
3+
5
6
=______;
5-
7
11
=______;
5
7
+
2
7
=______;
5
6
-
3
12
=______;
1
3
+
1
6
=______;
2.2+6.8=______; 0.79-0.32=______; 1-
5
8
=______.
7
9
-
4
9
=
1
3
3
8
+
5
8
=1;
1
2
-
1
2
=0;
1
3
-
1
4
=
1
12
3+
5
6
=3
5
6
5-
7
11
=4
4
11
5
7
+
2
7
=1;
5
6
-
3
12
=
7
12
1
3
+
1
6
=
1
2
2.2+6.8=9; 0.79-0.32=0.47; 1-
5
8
=
3
8
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