-
20
以减法练习题（破十法）
例
：
15
—
8
=
7
5
10
2
18
—
9
=
15
—
9
=
12
—
9
=
16
—
8
=
13
—
8
=
16
—
7 =
17
—
9
=
14
—
9
=
11
—
9
=
15
—
8
=
12
—
8
=
15
—
7
=
16
—
9
=
13
—
9
=
17
—
8
=
14
—
8
=
11
—
8
=
14
—
7
=
13
—
7
=
12
—
7
=
11
—
7
=
15
—
6
=
14
—
6
=
13
—
6
=
12
—
6
=
13
—
5
=
13
—
4
=
12
—
3
=
13
—
5
=
11
—
6
=
12
—
5
=
12
—
4
=
11
—
3
=
12
—
5
=
14
—
5
=
11
—
5
=
11
—
4
=
11
—
2
=
11
—
5
=
13
—
4
=
12
—
4
=
11
—
4
=
16
—
7 =
15
—
7
=
14
—
7
=
18
—
9
=
15
—
9
=
13
—
7
=
12
—
9
=
16
—
8
=
17
—
9
=
14
—
9
=
12
—
7
=
11
—
9
=
15
—
8
=
16
—
9
=
13
—
9
=
11
—
7
=
17
—
8
=
14
—
8
=
13
—
4
=
12
—
4
=
11
—
4
=
12
—
3
=
11
—
3
=
11
—
2
=
13
—
5
=
13
—
8
=
16
—
7 =
12
—
6
=
15
—
9
=
12
—
5
=
12
—
8
=
15
—
7
=
11
—
6
=
14
—
9
=
11
—
5
=
11
—
8
=
14
—
7
=
14
—
5
=
13
—
9
=
13
—
4
=
12
—
4
=
11
—
4
=
12
—
3
=
11
—
3
=
11
—
2
=
13
—
5
=
13
—
8
=
16
—
7 =
12
—
6
=
15
—
9
=
12
—
5
=
12
—
8
=
15
—
7
=
11
—
6
=
14
—
9
=
11
—
5
=
11
—
8
=
14
—
7
=
14
—
5
=
13
—
9
=
13
—
4
=
12
—
4
=
11
—
4
=
16
—
7 =
15
—
7
=
14
—
7
=
18
—
9
=
15
—
9
=
13
—
7
=
12
—
9
=
16
—
8
=
17
—
9
=
14
—
9
=
12
—
7
=
11
—
9
=
15
—
8
=
16
—
9
=
13
—
9
=
11
—
7
=
17
—
8
=
14
—
8
=
13
—
4
=
12
—
4
=
11
—
4
=
16
—
7 =
15
—
7
=
14
—
7
=
18
—
9
=
15
—
9
=
13
—
7
=
12
—
9
=
16
—
8
=
17
—
9
=
14
—
9
=
12
—
7
=
11
—
9
=
15
—
8
=
16
—
9
=
13
—
9
=
11
—
7
=
17
—
8
=
14
—
8
=
13
—
4
=
12
—
4
=
11
—
4
=
12
—
3
=
11
—
3
=
11
—
2
=
13
—
5
=
13
—
8
=
16
—
7 =
12
—
6
=
15
—
9
=
12
—
5
=
12
—
8
=
15
—
7
=
11
—
6
=
14
—
9
=
11
—
5
=
11
—
8
=
14
—
7
=
14
—
5
=
13
—
9
=
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