张尚武-上海生物制品研究所

2020年10月15日发(作者：齐豫)

二年级数学口算练习题集
8
X
1
=
8
X
2
=
8
X
3
=
8
X
4
=
6
x
6
=
6
X
7
=
6
x
8
=
6
X
9
=
9
X
1
=
9
X
2
=
9
X
3
=
9
X
4
=
8
x
6
=
7
X
6
=
2
X
1
=
5
X
6
=
9
X
6
=
3
X
6
=
8
X
1
=
4
X
6
=
5
X
1
=
7
X
6
=
4
X
1
=
2
X
5
=
3
X
1
=
6
X
5
=
6
X
1
=
2
X
6
=

7
X
1
=

8
X
7
=
7
X
7
=
2
X
2
=
5
X
7
=
9
X
7
=
3
X
7
=
8
X
2
=
4
X
7
=
5
X
2
=
7
X
7
=
4
X
2
=
3
x
5
=
3
X
2
=
7
X
5
=
6
X
2
=
2
X
7
=
7
X
2
=
8
X
8
=
8
X
9
=
7
X
8
=
7
X
9
=
2
X
3
=
2
X
4
=
5
X
8
=
5
X
9
=
9
X
8
=
9
X
9
=
3
X
8
=
3
X
9
=
8
X
3
=
8
X
4
=
4
X
8
=
4
X
9
=
5
X
3
=
5
X
4
=
7
X
8
=
7
X
9
=
4
X
3
=
4
X
4
=
4
X
5
=
5
X
5
=
3
X
3
=
3
X
4
=
8
X
5
=
9
X
5
=
6
X
3
=
6
X
4
=
2
X
8
=
2
X
9
=
7
X
3
=
7
X
4
=
1 2

6
x
6
=
6
x
7
=
6
x
8
=
6
X
9
=
9
x
2
=
9
x
3
=
9
x
4
=
9
X
1
8
x
7
=
8
x
8
=
8
x
9
=
=
x =
2 2

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