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곱셈: 2 x 21X5

1

		1	5
		7	3
		4	5
1	0	5	0
1	0	9	5

2

		7	0
		2	5
	3	5	0
1	4	0	0
1	7	5	0

3

		7	3
		5	4
	2	9	2
3	6	5	0
3	9	4	2

4

		5	1
		5	4
	2	0	4
2	5	5	0
2	7	5	4

5

		7	3
		8	9
	6	5	7
5	8	4	0
6	4	9	7

6

		4	8
		2	2
		9	6
	9	6	0
1	0	5	6

7

		9	7
		1	0
			0
	9	7	0
	9	7	0

8

		4	5
		4	4
	1	8	0
1	8	0	0
1	9	8	0

9

		2	0
		5	4
		8	0
1	0	0	0
1	0	8	0

10

		2	4
		4	4
		9	6
	9	6	0
1	0	5	6

11

		3	2
		6	9
	2	8	8
1	9	2	0
2	2	0	8

12

		3	8
		1	3
	1	1	4
	3	8	0
	4	9	4

13

		4	1
		9	9
	3	6	9
3	6	9	0
4	0	5	9

14

		2	4
		4	1
		2	4
	9	6	0
	9	8	4

15

		6	3
		3	2
	1	2	6
1	8	9	0
2	0	1	6

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