[Script Info]
Title: 
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.00,0:00:06.84,Default,,0000,0000,0000,,4 x (-5) x (-7.5) = ?
Dialogue: 0,0:00:06.84,0:00:09.58,Default,,0000,0000,0000,,계산해야 할\N세 숫자엔
Dialogue: 0,0:00:09.58,0:00:11.57,Default,,0000,0000,0000,,양수도 있고\N음수도 있어요
Dialogue: 0,0:00:11.57,0:00:14.88,Default,,0000,0000,0000,,모두 곱셈이니까\N순서대로 계산하죠
Dialogue: 0,0:00:14.88,0:00:17.82,Default,,0000,0000,0000,,4 x (-5)를 하고
Dialogue: 0,0:00:17.82,0:00:21.67,Default,,0000,0000,0000,,그 값에 \N-7.5를 곱합시다
Dialogue: 0,0:00:21.67,0:00:23.75,Default,,0000,0000,0000,,문제를\N다시 써볼까요
Dialogue: 0,0:00:23.75,0:00:29.44,Default,,0000,0000,0000,,4 x (-5) x (-7.5) = ?
Dialogue: 0,0:00:29.44,0:00:32.90,Default,,0000,0000,0000,,음수의 괄호는\N곱하기를 포함하므로
Dialogue: 0,0:00:32.90,0:00:35.96,Default,,0000,0000,0000,,꼭 점(.)를 찍진\N않아도 됩니다
Dialogue: 0,0:00:35.96,0:00:37.85,Default,,0000,0000,0000,,풀기 전에\N기억해두세요
Dialogue: 0,0:00:37.85,0:00:42.44,Default,,0000,0000,0000,,'양수 x 양수'\N는 양수고
Dialogue: 0,0:00:42.44,0:00:45.05,Default,,0000,0000,0000,,'양수 x 음수', \N'음수 x 양수'
Dialogue: 0,0:00:45.05,0:00:47.58,Default,,0000,0000,0000,,이처럼 부호가 다르면 \N결과가 음수죠
Dialogue: 0,0:00:47.58,0:00:50.38,Default,,0000,0000,0000,,부호가 같으면\N각각이 음수여도
Dialogue: 0,0:00:50.38,0:00:52.38,Default,,0000,0000,0000,,양수를\N얻습니다
Dialogue: 0,0:00:52.38,0:00:54.67,Default,,0000,0000,0000,,그럼 이 문제를\N풀어보죠
Dialogue: 0,0:00:54.67,0:00:56.70,Default,,0000,0000,0000,,4 x (-5)
Dialogue: 0,0:00:56.70,0:01:00.59,Default,,0000,0000,0000,,계산하면\N20이죠
Dialogue: 0,0:01:00.59,0:01:05.43,Default,,0000,0000,0000,,4 x (-5) 즉\N즉 '양수 x 음수' 니까
Dialogue: 0,0:01:05.43,0:01:07.53,Default,,0000,0000,0000,,결과는\N음수입니다
Dialogue: 0,0:01:07.53,0:01:10.00,Default,,0000,0000,0000,,서로 부호가 \N다르니까요
Dialogue: 0,0:01:10.00,0:01:15.87,Default,,0000,0000,0000,,(-20) x (-7.5)\N가 됐습니다
Dialogue: 0,0:01:15.87,0:01:20.70,Default,,0000,0000,0000,,옆에 따로 써서 \N계산하겠습니다
Dialogue: 0,0:01:20.70,0:01:25.27,Default,,0000,0000,0000,,7.5 x 20
Dialogue: 0,0:01:25.27,0:01:27.35,Default,,0000,0000,0000,,0 x 5 는 0
Dialogue: 0,0:01:27.35,0:01:29.49,Default,,0000,0000,0000,,0 x 7 도 0
Dialogue: 0,0:01:29.49,0:01:31.35,Default,,0000,0000,0000,,아래에 0을\N미리 쓸게요
Dialogue: 0,0:01:31.35,0:01:33.74,Default,,0000,0000,0000,,사실 20으로\N곱하는 거죠
Dialogue: 0,0:01:33.74,0:01:35.92,Default,,0000,0000,0000,,2 x 5는 10 \N0을 써주고 1를 올려줍니다
Dialogue: 0,0:01:35.92,0:01:38.29,Default,,0000,0000,0000,,2 x 7은 14
Dialogue: 0,0:01:38.29,0:01:40.90,Default,,0000,0000,0000,,거기에 1을\N더하면 15
Dialogue: 0,0:01:40.91,0:01:46.68,Default,,0000,0000,0000,,각각 더해주면\N0, 0, 5, 1 따라서 1500
Dialogue: 0,0:01:46.68,0:01:48.28,Default,,0000,0000,0000,,소숫점 뒤에\N숫자를 세보니
Dialogue: 0,0:01:48.28,0:01:50.37,Default,,0000,0000,0000,,한 개이니까
Dialogue: 0,0:01:50.38,0:01:58.12,Default,,0000,0000,0000,,1,500에서 맨 끝의 0 앞에\N소숫점을 찍어주면 됩니다
Dialogue: 0,0:01:58.12,0:02:04.71,Default,,0000,0000,0000,,따라서 20 x 7.5 = 150
Dialogue: 0,0:02:04.71,0:02:08.27,Default,,0000,0000,0000,,이제 부호를\N생각해 봅시다
Dialogue: 0,0:02:08.27,0:02:12.14,Default,,0000,0000,0000,,음수 x 음수는 \N같은 부호니까 양수죠
Dialogue: 0,0:02:12.14,0:02:16.03,Default,,0000,0000,0000,,따라서 답은 양수가 되겠네요
Dialogue: 0,0:02:16.03,0:02:19.07,Default,,0000,0000,0000,,답은 150입니다
Dialogue: 0,0:02:19.07,0:02:21.37,Default,,0000,0000,0000,,정확하게\N보여주기 위해
Dialogue: 0,0:02:21.37,0:02:25.44,Default,,0000,0000,0000,,여기 소숫점을 찍어서\N150.0이라고 쓰겠습니다