WEBVTT 00:00:00.520 --> 00:00:04.710 Liam mở một tài khoản tiết kiệm và bỏ vào đó 6250 đô. 00:00:04.710 --> 00:00:08.330 Mỗi năm tài khoản tăng 20%. 00:00:08.330 --> 00:00:13.540 Thế bao nhiêu năm thì tài khoản sẽ được 12960 đô? 00:00:13.540 --> 00:00:15.600 Hãy viết một phương trình biểu diễn tình huống này, 00:00:15.600 --> 00:00:17.590 với t sẽ số năm 00:00:17.590 --> 00:00:21.207 từ khi Liam mở tài khoản. 00:00:21.207 --> 00:00:22.790 Mình khuyến khích bạn tạm dừng video 00:00:22.790 --> 00:00:24.430 và tự giải thử nhé. 00:00:24.430 --> 00:00:26.710 Hãy thử viết phương trình này biểu diễn tình huống 00:00:26.710 --> 00:00:29.487 sử dụng biến t. 00:00:29.487 --> 00:00:31.070 Và sau đó trả lời câu hỏi, 00:00:31.070 --> 00:00:36.297 bao nhiêu năm để tài khoản được 12960 đô? 00:00:36.297 --> 00:00:37.630 Hãy nghĩ thử xem nào. 00:00:37.630 --> 00:00:39.750 t biểu diễn số năm từ khi 00:00:39.750 --> 00:00:41.260 Liam mở tài khoản. 00:00:41.260 --> 00:00:44.159 Vậy giả sử nó là 0 năm từ khi 00:00:44.159 --> 00:00:44.950 Liam mở tài khoản. 00:00:44.950 --> 00:00:46.290 Anh ấy sẽ có bao nhiêu nào? 00:00:46.290 --> 00:00:49.590 Anh ấy sẽ có 6250 đô đúng không. 00:00:49.590 --> 00:00:51.480 Đó là số tiền ban đầu của anh ấy. 00:00:51.480 --> 00:00:54.219 GIả sử giờ là 1 năm từ khi 00:00:54.219 --> 00:00:55.010 anh ấy mở tài khoản. 00:00:55.010 --> 00:00:56.510 Thế anh ấy sẽ có bao nhiêu? 00:00:56.510 --> 00:01:01.060 Vâng anh ấy sẽ có 6250 đô nhân, 00:01:01.060 --> 00:01:08.880 hãy viết nó theo cách này, cộng 20% của 6250. 00:01:08.880 --> 00:01:11.180 Nó tăng 20% mỗi năm. 00:01:11.180 --> 00:01:13.900 Nên đây là số tiền ban đầu 00:01:13.900 --> 00:01:18.180 thêm với 20% của 6250 đô đó nữa. 00:01:18.180 --> 00:01:20.880 Nếu ta nhân phân phối 6250 ra, thì 00:01:20.880 --> 00:01:29.730 00:01:29.730 --> 00:01:38.795 00:01:38.795 --> 00:01:42.135 00:01:42.135 --> 00:01:44.385 00:01:44.385 --> 00:01:48.890 00:01:48.890 --> 00:01:50.774 00:01:50.774 --> 00:01:52.440 00:01:52.440 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