[Script Info]
Title: 
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.68,0:00:05.28,Default,,0000,0000,0000,,음수의 곱셈 및 나눗셈에\N오신 것을 환영합니다
Dialogue: 0,0:00:05.28,0:00:06.75,Default,,0000,0000,0000,,시작해볼까요?
Dialogue: 0,0:00:06.75,0:00:10.53,Default,,0000,0000,0000,,몇 가지만 알면 \N음수의 곱셈 및 나눗셈이 \N
Dialogue: 0,0:00:10.53,0:00:13.91,Default,,0000,0000,0000,,훨씬 쉬워질 것입니다\N
Dialogue: 0,0:00:13.91,0:00:16.42,Default,,0000,0000,0000,,실제로 두 음수를 \N곱하는 기초적 규칙을
Dialogue: 0,0:00:16.42,0:00:17.99,Default,,0000,0000,0000,,알아보고
Dialogue: 0,0:00:17.99,0:00:20.99,Default,,0000,0000,0000,,우선 그에 관한 기초부터 \N가르쳐드릴려고 합니다
Dialogue: 0,0:00:20.99,0:00:25.22,Default,,0000,0000,0000,,음수와 음수를 곱할때,
Dialogue: 0,0:00:25.22,0:00:31.79,Default,,0000,0000,0000,,-2 x (- 2) 를 해 봅시다
Dialogue: 0,0:00:31.79,0:00:33.97,Default,,0000,0000,0000,,두 수를 각각 \N부호가 없는 것처럼
Dialogue: 0,0:00:33.97,0:00:35.24,Default,,0000,0000,0000,,생각해볼게요
Dialogue: 0,0:00:35.24,0:00:40.15,Default,,0000,0000,0000,,2 x 2 = 4 입니다
Dialogue: 0,0:00:40.15,0:00:42.67,Default,,0000,0000,0000,,음수 x 음수를 하면
Dialogue: 0,0:00:42.67,0:00:45.18,Default,,0000,0000,0000,,양수가 된다고 \N알고 있습니다
Dialogue: 0,0:00:45.18,0:00:47.71,Default,,0000,0000,0000,,첫 번째 법칙을 \N써보겠습니다
Dialogue: 0,0:00:47.71,0:00:56.74,Default,,0000,0000,0000,,음수 x 음수는 \N양수입니다
Dialogue: 0,0:00:56.74,0:01:01.89,Default,,0000,0000,0000,,-2 x 2 는 얼마입니까?
Dialogue: 0,0:01:01.89,0:01:04.77,Default,,0000,0000,0000,,우선 부호에 상관없이
Dialogue: 0,0:01:04.77,0:01:06.06,Default,,0000,0000,0000,,계산을 합니다
Dialogue: 0,0:01:06.06,0:01:10.06,Default,,0000,0000,0000,,2 x 2 = 4 인데
Dialogue: 0,0:01:10.06,0:01:13.74,Default,,0000,0000,0000,,-2 x 2 를 하고 있으므로
Dialogue: 0,0:01:13.74,0:01:15.91,Default,,0000,0000,0000,,음수에 양수를 곱하면
Dialogue: 0,0:01:15.91,0:01:18.92,Default,,0000,0000,0000,,음수를 얻습니다\N
Dialogue: 0,0:01:18.92,0:01:20.26,Default,,0000,0000,0000,,이 것이 다른 \N또 하나의 법칙입니다
Dialogue: 0,0:01:20.26,0:01:29.01,Default,,0000,0000,0000,,음수 x 양수= 음수입니다
Dialogue: 0,0:01:29.01,0:01:34.79,Default,,0000,0000,0000,,2 x -2 는 얼마입니까?
Dialogue: 0,0:01:34.79,0:01:37.14,Default,,0000,0000,0000,,추측해볼까요?
Dialogue: 0,0:01:37.14,0:01:41.17,Default,,0000,0000,0000,,위와 아주 많이 비슷하죠?
Dialogue: 0,0:01:41.17,0:01:44.28,Default,,0000,0000,0000,,두 수를 바꿀 수 있는\N
Dialogue: 0,0:01:44.28,0:01:45.86,Default,,0000,0000,0000,,교환법칙 입니다
Dialogue: 0,0:01:45.86,0:01:47.70,Default,,0000,0000,0000,,기억하세요
Dialogue: 0,0:01:47.70,0:01:51.78,Default,,0000,0000,0000,,2 x (-2) = -4 입니다
Dialogue: 0,0:01:51.78,0:01:57.64,Default,,0000,0000,0000,,그리고, 양수 x 음수는 \N양수가 되는
Dialogue: 0,0:01:57.64,0:01:59.99,Default,,0000,0000,0000,,마지막 법칙이 있습니다
Dialogue: 0,0:01:59.99,0:02:05.01,Default,,0000,0000,0000,,마지막 두 가지 법칙은\N같은 것입니다
Dialogue: 0,0:02:05.01,0:02:07.57,Default,,0000,0000,0000,,음수 x 양수 = 음수이고,
Dialogue: 0,0:02:07.57,0:02:09.14,Default,,0000,0000,0000,,양수 x 음수= 음수
Dialogue: 0,0:02:09.14,0:02:13.73,Default,,0000,0000,0000,,두 수의 부호가 다를 때 \N두 수를 곱하면
Dialogue: 0,0:02:13.73,0:02:16.40,Default,,0000,0000,0000,,음수를 얻는다고 \N할 수도 있습니다
Dialogue: 0,0:02:16.40,0:02:18.89,Default,,0000,0000,0000,,물론, 양수 x 양수를 하면
Dialogue: 0,0:02:18.89,0:02:21.55,Default,,0000,0000,0000,,무엇인지 알고있죠?
Dialogue: 0,0:02:21.55,0:02:22.84,Default,,0000,0000,0000,,그냥 양수입니다
Dialogue: 0,0:02:22.84,0:02:23.90,Default,,0000,0000,0000,,다시 봐볼까요?
Dialogue: 0,0:02:23.90,0:02:27.97,Default,,0000,0000,0000,,'음수 x 음수 = 양수' 입니다
Dialogue: 0,0:02:27.97,0:02:30.39,Default,,0000,0000,0000,,'음수 x 양수 = 음수' 입니다
Dialogue: 0,0:02:30.39,0:02:32.73,Default,,0000,0000,0000,,'양수 x 음수 = 음수' 입니다
Dialogue: 0,0:02:32.73,0:02:36.29,Default,,0000,0000,0000,,그리고 양수끼리 곱하면\N양수입니다
Dialogue: 0,0:02:36.29,0:02:39.98,Default,,0000,0000,0000,,알겠나요?
Dialogue: 0,0:02:39.98,0:02:42.27,Default,,0000,0000,0000,,정리해보자면
Dialogue: 0,0:02:42.27,0:02:46.35,Default,,0000,0000,0000,,곱하기를 할 때 두 수가
Dialogue: 0,0:02:46.35,0:02:57.74,Default,,0000,0000,0000,,같은 부호이면 양수를 얻습니다
Dialogue: 0,0:02:57.74,0:03:11.02,Default,,0000,0000,0000,,그리고다른 부호면 \N음수를 얻습니다
Dialogue: 0,0:03:11.02,0:03:14.77,Default,,0000,0000,0000,,각각의 예를 들면
Dialogue: 0,0:03:14.78,0:03:17.78,Default,,0000,0000,0000,,1 x 1 = 1 이고,
Dialogue: 0,0:03:17.78,0:03:22.12,Default,,0000,0000,0000,,또는 -1 x (-1) 은 \N마찬가지로
Dialogue: 0,0:03:22.12,0:03:23.51,Default,,0000,0000,0000,,양수 1 입니다
Dialogue: 0,0:03:23.51,0:03:29.15,Default,,0000,0000,0000,,1 x (-1) = -1 이고
Dialogue: 0,0:03:29.15,0:03:32.60,Default,,0000,0000,0000,,-1 x 1 = -1 입니다
Dialogue: 0,0:03:32.60,0:03:36.13,Default,,0000,0000,0000,,여기서 두 부호가 다른
Dialogue: 0,0:03:36.13,0:03:38.59,Default,,0000,0000,0000,,1 과 -1 이 있는 것이 \N보이시죠?
Dialogue: 0,0:03:38.59,0:03:41.12,Default,,0000,0000,0000,,그리고 위에서는
Dialogue: 0,0:03:41.12,0:03:42.68,Default,,0000,0000,0000,,두 개의 1 이 양수입니다
Dialogue: 0,0:03:42.68,0:03:45.97,Default,,0000,0000,0000,,옆에 있는 \N두 개의 1 은 음수입니다
Dialogue: 0,0:03:45.97,0:03:47.67,Default,,0000,0000,0000,,다른 문제를 해볼까요?
Dialogue: 0,0:03:47.67,0:03:55.99,Default,,0000,0000,0000,,더 이해하기 위해서\N여러 연습 문제를 풀어봅시다
Dialogue: 0,0:03:58.82,0:04:00.58,Default,,0000,0000,0000,,만약에
Dialogue: 0,0:04:00.58,0:04:09.79,Default,,0000,0000,0000,,-4 x 3 을 해본다면\N4 x 3 = 12
Dialogue: 0,0:04:09.79,0:04:12.15,Default,,0000,0000,0000,,음수와 양수입니다
Dialogue: 0,0:04:12.15,0:04:15.67,Default,,0000,0000,0000,,서로 다른 부호니까 \N답은 음수가 됩니다
Dialogue: 0,0:04:15.67,0:04:19.00,Default,,0000,0000,0000,,-4 x 3 = -12 입니다
Dialogue: 0,0:04:19.00,0:04:20.50,Default,,0000,0000,0000,,다시 말해보면
Dialogue: 0,0:04:20.50,0:04:24.22,Default,,0000,0000,0000,,-4 에 3 을 곱하는 것은
Dialogue: 0,0:04:24.22,0:04:26.85,Default,,0000,0000,0000,,-4 + (-4) + (-4) 와 같으므로
Dialogue: 0,0:04:26.85,0:04:29.02,Default,,0000,0000,0000,,음수 12가 됩니다
Dialogue: 0,0:04:29.02,0:04:31.35,Default,,0000,0000,0000,,음수의 덧셈과 \N뺄셈 강의를 봤다면
Dialogue: 0,0:04:31.35,0:04:34.20,Default,,0000,0000,0000,,알 수 있어야 합니다
Dialogue: 0,0:04:34.20,0:04:35.21,Default,,0000,0000,0000,,다른 것을 볼까요?
Dialogue: 0,0:04:35.21,0:04:40.43,Default,,0000,0000,0000,,-2 x (-7) 은 \N얼마입니까?
Dialogue: 0,0:04:40.43,0:04:42.47,Default,,0000,0000,0000,,동영상을 잠시 멈추고
Dialogue: 0,0:04:42.47,0:04:44.03,Default,,0000,0000,0000,,답을 생각해 본 후
Dialogue: 0,0:04:44.03,0:04:45.42,Default,,0000,0000,0000,,다시 시작해 봅시다
Dialogue: 0,0:04:45.42,0:04:51.19,Default,,0000,0000,0000,,2 x 7 = 14이고, \N같은 부호 이므로
Dialogue: 0,0:04:51.19,0:04:53.93,Default,,0000,0000,0000,,양수 14 입니다\N보통 +를 쓸 필요는 없지만
Dialogue: 0,0:04:53.93,0:04:56.93,Default,,0000,0000,0000,,확실하게 하기위해\N표시했습니다
Dialogue: 0,0:04:56.93,0:05:05.88,Default,,0000,0000,0000,,다른걸 볼까요?\N9 x (-5) = ?
Dialogue: 0,0:05:05.88,0:05:08.80,Default,,0000,0000,0000,,9 x 5 = 45
Dialogue: 0,0:05:08.80,0:05:13.66,Default,,0000,0000,0000,,부호가 다르므로 음수가 됩니다
Dialogue: 0,0:05:13.66,0:05:19.52,Default,,0000,0000,0000,,그리고 마지막으로
Dialogue: 0,0:05:19.52,0:05:24.54,Default,,0000,0000,0000,,-6 x (-11) = ?
Dialogue: 0,0:05:24.54,0:05:29.73,Default,,0000,0000,0000,,6 x 11 = 66 이고,\N모두 음수니까
Dialogue: 0,0:05:29.73,0:05:31.72,Default,,0000,0000,0000,,답은 양수입니다
Dialogue: 0,0:05:31.72,0:05:32.91,Default,,0000,0000,0000,,이건 어떨까요?
Dialogue: 0,0:05:32.91,0:05:39.10,Default,,0000,0000,0000,,0 x (-12) 는 얼마입니까?
Dialogue: 0,0:05:39.10,0:05:42.74,Default,,0000,0000,0000,,부호가 다르다고 생각하겠지만
Dialogue: 0,0:05:42.74,0:05:46.46,Default,,0000,0000,0000,,0 은 실제로 \N양수도 음수도 아닙니다
Dialogue: 0,0:05:46.46,0:05:48.60,Default,,0000,0000,0000,,그리고 0 에 어떤 수를 \N곱해도 여전히 0 입니다
Dialogue: 0,0:05:48.60,0:05:53.52,Default,,0000,0000,0000,,양수든 음수든\N상관 없습니다
Dialogue: 0,0:05:53.52,0:05:57.63,Default,,0000,0000,0000,,0 곱하기 어떤 수도 \N여전히 0 입니다
Dialogue: 0,0:05:57.63,0:06:00.02,Default,,0000,0000,0000,,나눗셈에도 같을까요?
Dialogue: 0,0:06:00.02,0:06:03.08,Default,,0000,0000,0000,,네, 그렇습니다
Dialogue: 0,0:06:03.08,0:06:09.03,Default,,0000,0000,0000,,9 ÷ (- 3) 을 해봅시다
Dialogue: 0,0:06:09.03,0:06:11.82,Default,,0000,0000,0000,,9 ÷ 3 은 얼마일까요?
Dialogue: 0,0:06:11.82,0:06:13.64,Default,,0000,0000,0000,,3 이겠지요?
Dialogue: 0,0:06:13.64,0:06:17.92,Default,,0000,0000,0000,,서로 다른 부호니까,\N9 와 - 3
Dialogue: 0,0:06:17.92,0:06:22.19,Default,,0000,0000,0000,,다른 부호끼리 나눠 \N음수가 됩니다
Dialogue: 0,0:06:22.19,0:06:27.52,Default,,0000,0000,0000,,9 ÷ (-3) = -3 입니다
Dialogue: 0,0:06:27.52,0:06:33.83,Default,,0000,0000,0000,,-16 ÷ 8 은 얼마입니까?
Dialogue: 0,0:06:33.83,0:06:37.79,Default,,0000,0000,0000,,16 ÷ 8 = 2 인데,
Dialogue: 0,0:06:37.79,0:06:39.37,Default,,0000,0000,0000,,서로 부호가 다르므로
Dialogue: 0,0:06:39.37,0:06:44.83,Default,,0000,0000,0000,,-16 ÷ 8 = -2 입니다
Dialogue: 0,0:06:44.83,0:06:49.14,Default,,0000,0000,0000,,서로 다른 부호는 \N음수가 됩니다
Dialogue: 0,0:06:49.14,0:07:00.50,Default,,0000,0000,0000,,-54 ÷ (-6) 은 얼마입니까?
Dialogue: 0,0:07:00.50,0:07:04.32,Default,,0000,0000,0000,,54 ÷ 6 = 9 이고
Dialogue: 0,0:07:04.32,0:07:09.27,Default,,0000,0000,0000,,나누는 수와 나누어지는 수가
Dialogue: 0,0:07:09.27,0:07:13.89,Default,,0000,0000,0000,,둘 다 음수이므로\N-54 와 -6
Dialogue: 0,0:07:13.91,0:07:22.48,Default,,0000,0000,0000,,-54 ÷ (-6) = 9가 됩니다
Dialogue: 0,0:07:22.48,0:07:24.73,Default,,0000,0000,0000,,하나 더 해보겠습니다
Dialogue: 0,0:07:24.73,0:07:30.50,Default,,0000,0000,0000,,0 을 어떤 수로 나누면 \N여전히 0 입니다
Dialogue: 0,0:07:30.50,0:07:31.51,Default,,0000,0000,0000,,그렇죠?
Dialogue: 0,0:07:31.51,0:07:34.76,Default,,0000,0000,0000,,어떤 수를 \N0 으로 나눌 수는 없으므로
Dialogue: 0,0:07:34.76,0:07:36.21,Default,,0000,0000,0000,,정의되지 않으니까요
Dialogue: 0,0:07:36.21,0:07:38.42,Default,,0000,0000,0000,,하나 더 볼까요?
Dialogue: 0,0:07:38.42,0:07:41.89,Default,,0000,0000,0000,,다른 수를 생각해 봅시다
Dialogue: 0,0:07:41.89,0:07:44.93,Default,,0000,0000,0000,,4 를 -1 로 나누면?
Dialogue: 0,0:07:44.93,0:07:50.61,Default,,0000,0000,0000,,4 ÷ 1 = 4 인데, \N부호가 서로 다르네요
Dialogue: 0,0:07:50.61,0:07:53.13,Default,,0000,0000,0000,,그래서 -4 입니다
Dialogue: 0,0:07:53.13,0:07:54.41,Default,,0000,0000,0000,,도움이 되었나요?
Dialogue: 0,0:07:54.41,0:07:56.86,Default,,0000,0000,0000,,말씀드리고 싶은 것은\N할 수 있는만큼
Dialogue: 0,0:07:56.86,0:08:01.38,Default,,0000,0000,0000,,연습을 충분히 \N해 보라는 것입니다
Dialogue: 0,0:08:01.38,0:08:03.01,Default,,0000,0000,0000,,힌트를 누르면 \N어떤 규칙을 사용해야하는지를
Dialogue: 0,0:08:03.01,0:08:04.26,Default,,0000,0000,0000,,알려줄 것입니다
Dialogue: 0,0:08:04.26,0:08:09.32,Default,,0000,0000,0000,,시간을 내어, \N왜 이 규칙이 작용하고
Dialogue: 0,0:08:09.32,0:08:13.56,Default,,0000,0000,0000,,음수에 양수를 곱하는 것의\N의미하는 바를
Dialogue: 0,0:08:13.56,0:08:15.32,Default,,0000,0000,0000,,생각해보세요
Dialogue: 0,0:08:15.32,0:08:16.98,Default,,0000,0000,0000,,더 재미 있는 것은,
Dialogue: 0,0:08:16.98,0:08:20.23,Default,,0000,0000,0000,,음수에 음수를 \N곱하는 것입니다
Dialogue: 0,0:08:20.23,0:08:23.22,Default,,0000,0000,0000,,하지만 지금도 충분히\N
Dialogue: 0,0:08:23.22,0:08:27.16,Default,,0000,0000,0000,,문제를 풀 수 \N있을 것으로 생각합니다
Dialogue: 0,0:08:27.16,0:08:28.71,Default,,0000,0000,0000,,행운을 빌어요!