题目内容

口算.
1
2
×
1
3
=
2
19
×
19
20
=
4
7
×
3
5
+
4
7
×
2
5
=
1
7
9
÷
7
8
=
5
6
÷
2
3
÷
5
6
=
0.375+
5
8
=
3÷
1
3
×3
=
10-
2
9
-
7
9
=
22=33=
1
2
×
1
3
=
1
6
2
19
×
19
20
=
1
10
4
7
×
3
5
+
4
7
×
2
5
=
4
7
1
7
9
÷
7
8
=
128
63

5
6
÷
2
3
÷
5
6
=
3
2
0.375+
5
8
=1 3÷
1
3
×3=27 10-
2
9
-
7
9
=1
22=4 33=27.
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