[Script Info]
Title: 
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.30,0:00:09.06,Default,,0000,0000,0000,,5 x √117을\N간단히 해 봅시다
Dialogue: 0,0:00:09.06,0:00:13.06,Default,,0000,0000,0000,,117은 완전제곱수가 \N아닙니다
Dialogue: 0,0:00:13.06,0:00:14.99,Default,,0000,0000,0000,,그러면 인수분해를 해서
Dialogue: 0,0:00:14.99,0:00:20.13,Default,,0000,0000,0000,,두 번 이상 나타나는\N인수를 찾아 봅시다
Dialogue: 0,0:00:20.13,0:00:21.75,Default,,0000,0000,0000,,117은 홀수입니다
Dialogue: 0,0:00:21.75,0:00:24.14,Default,,0000,0000,0000,,2로는 나눌 수 없죠
Dialogue: 0,0:00:24.14,0:00:25.73,Default,,0000,0000,0000,,3으로 나눌 수 있는지\N확인합시다
Dialogue: 0,0:00:25.73,0:00:29.48,Default,,0000,0000,0000,,117에서 모든 숫자들을 \N더해 봅시다
Dialogue: 0,0:00:29.48,0:00:31.86,Default,,0000,0000,0000,,모든 숫자를 다 더하면\N9가 나옵니다
Dialogue: 0,0:00:31.86,0:00:34.52,Default,,0000,0000,0000,,9는 3으로 \N나눠지기 때문에
Dialogue: 0,0:00:34.52,0:00:37.60,Default,,0000,0000,0000,,117도 역시 \N3으로 나눠집니다
Dialogue: 0,0:00:37.60,0:00:40.92,Default,,0000,0000,0000,,117을 3으로 나누면\N몇 일까요?
Dialogue: 0,0:00:40.92,0:00:43.70,Default,,0000,0000,0000,,3은 1에 들어가지 않죠
Dialogue: 0,0:00:43.70,0:00:46.01,Default,,0000,0000,0000,,하지만 11에는 \N3이 3번 들어가죠
Dialogue: 0,0:00:46.01,0:00:47.67,Default,,0000,0000,0000,,3 x3은 9
Dialogue: 0,0:00:47.67,0:00:50.39,Default,,0000,0000,0000,,11에서 9를 빼면\N2가 남습니다
Dialogue: 0,0:00:50.39,0:00:52.98,Default,,0000,0000,0000,,이제 7을 내립니다
Dialogue: 0,0:00:52.98,0:00:55.85,Default,,0000,0000,0000,,3은 27에 \N9번 들어갑니다
Dialogue: 0,0:00:55.85,0:00:58.09,Default,,0000,0000,0000,,9 x 3은 27입니다
Dialogue: 0,0:00:58.09,0:00:59.17,Default,,0000,0000,0000,,27 - 27이면 0이네요
Dialogue: 0,0:00:59.17,0:01:02.08,Default,,0000,0000,0000,,나머지 없이\N모두 나누어지네요
Dialogue: 0,0:01:02.08,0:01:07.55,Default,,0000,0000,0000,,117은 3 x 39로 \N인수분해할 수 있습니다
Dialogue: 0,0:01:07.55,0:01:10.94,Default,,0000,0000,0000,,이제는 39를 \N인수분해해야 합니다
Dialogue: 0,0:01:10.94,0:01:13.01,Default,,0000,0000,0000,,3으로 나눌 수 있다는 것을 \N알기 쉬워졌네요
Dialogue: 0,0:01:13.01,0:01:15.82,Default,,0000,0000,0000,,39는 \N3 x 13입니다
Dialogue: 0,0:01:15.82,0:01:18.32,Default,,0000,0000,0000,,이제는 모든 수가 다\N소수가 됐네요
Dialogue: 0,0:01:18.32,0:01:23.58,Default,,0000,0000,0000,,이것은 5에다가
Dialogue: 0,0:01:23.58,0:01:37.06,Default,,0000,0000,0000,,√(3 x 3 x 13) 를 곱했다고\N할 수 있죠
Dialogue: 0,0:01:37.06,0:01:40.93,Default,,0000,0000,0000,,이것은 지수법칙에 따라
Dialogue: 0,0:01:40.93,0:01:55.07,Default,,0000,0000,0000,,5 x √(3x3) x √13
Dialogue: 0,0:01:55.07,0:01:57.32,Default,,0000,0000,0000,,√(3x3)는 뭐죠?
Dialogue: 0,0:01:57.32,0:01:59.73,Default,,0000,0000,0000,,9의 제곱근과 같죠?
Dialogue: 0,0:01:59.73,0:02:01.49,Default,,0000,0000,0000,,그러니까 간단히 하면
Dialogue: 0,0:02:01.49,0:02:04.59,Default,,0000,0000,0000,,3이 나오죠?
Dialogue: 0,0:02:04.59,0:02:10.47,Default,,0000,0000,0000,,이것은 결국 5 x 3 x √13 입니다
Dialogue: 0,0:02:10.47,0:02:14.75,Default,,0000,0000,0000,,5 x 3은 15
Dialogue: 0,0:02:14.75,0:02:19.85,Default,,0000,0000,0000,,15 x √13
Dialogue: 0,0:02:19.85,0:02:21.75,Default,,0000,0000,0000,,예를 하나\N더 들어봅시다
Dialogue: 0,0:02:21.75,0:02:31.77,Default,,0000,0000,0000,,3 √26을 간단히 해 보세요
Dialogue: 0,0:02:31.77,0:02:37.44,Default,,0000,0000,0000,,26은 딱 봐도\N짝수인 것을 알 수 있습니다
Dialogue: 0,0:02:37.44,0:02:38.90,Default,,0000,0000,0000,,그러니 2로 나눠지죠
Dialogue: 0,0:02:38.90,0:02:41.92,Default,,0000,0000,0000,,그러면 2 x 13이라고\N다시 쓸 수 있죠
Dialogue: 0,0:02:41.92,0:02:42.75,Default,,0000,0000,0000,,끝났죠?
Dialogue: 0,0:02:42.75,0:02:43.82,Default,,0000,0000,0000,,13은 소수이기 때문에
Dialogue: 0,0:02:43.82,0:02:45.86,Default,,0000,0000,0000,,더 이상 인수분해\N할 수 없죠
Dialogue: 0,0:02:45.86,0:02:48.20,Default,,0000,0000,0000,,따라서 26은 \N완전제곱수가 없습니다
Dialogue: 0,0:02:48.20,0:02:49.62,Default,,0000,0000,0000,,빼내서 쓸 수 있는\N수가 없죠?
Dialogue: 0,0:02:49.62,0:02:50.97,Default,,0000,0000,0000,,다른 수와는 달리
Dialogue: 0,0:02:50.97,0:02:52.72,Default,,0000,0000,0000,,완전제곱꼴이 \N아니기 때문입니다
Dialogue: 0,0:02:52.72,0:02:55.43,Default,,0000,0000,0000,,117은 13x 9이였죠
Dialogue: 0,0:02:55.43,0:02:58.41,Default,,0000,0000,0000,,이것은 13과 완전제곱수인\N9의 곱이였습니다
Dialogue: 0,0:02:58.41,0:03:01.78,Default,,0000,0000,0000,,26은 안 그렇지만 우리가\N최대한 간단히 하였죠?
Dialogue: 0,0:03:01.78,0:03:07.83,Default,,0000,0000,0000,,그냥 3√26으로 나둬야죠