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덧셈: 2 + 12+7

		2	7
			7
		3	4

		5	9
			3
		6	2

		2	0
			6
		2	6

		4	6
			3
		4	9

	9	8
		3
1	0	1

		2	0
			8
		2	8

		3	6
			8
		4	4

		1	1
			7
		1	8

		6	2
			8
		7	0

		1	2
			9
		2	1

		5	7
			5
		6	2

		3	0
			1
		3	1

	9	9
		5
1	0	4

		3	0
			3
		3	3

		8	4
			9
		9	3