题目内容

直接写得数.
1
2
+
1
3
=______;
18×
2
3
=______;
9
10
×
2
3
=______;
7
8
=______;
3
4
-
2
5
=______;
5
7
×21=______;
5
12
×
4
5
=______;
2
13
×6=______;
3
10
×
5
6
=______;
2
9
×9=______;
5
8
×
2
5
=______;
2-
7
9
=______.
1
2
+
1
3
=
5
6
18×
2
3
=12;
9
10
×
2
3
=
3
5
7
8
=
7
8
3
4
-
2
5
=
7
20
5
7
×21=15;
5
12
×
4
5
=
1
3
2
13
×6=
12
13
3
10
×
5
6
=
1
4
2
9
×9=2;
5
8
×
2
5
=
1
4
2-
7
9
=1
2
9
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