0:00:00.520,0:00:04.710
Liam mở một tài khoản tiết kiệm và bỏ vào đó 6250 đô.

0:00:04.710,0:00:08.330
Mỗi năm tài khoản tăng 20%.

0:00:08.330,0:00:13.540
Thế bao nhiêu năm thì nó sẽ được 12960 đô?

0:00:13.540,0:00:15.600
Hãy viết một phương trình biểu diễn tình huống này,

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với t sẽ số năm

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từ khi Liam mở tài khoản.

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Mình khuyến khích bạn tạm dừng video

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và tự giải thử nhé.

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Hãy thử viết phương trình này biểu diễn tình huống

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sử dụng biến t.

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Và sau đó trả lời câu hỏi,

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bao nhiêu năm để tài khoản được 12960 đô?

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Hãy nghĩ thử xem nào.

0:00:37.630,0:00:39.750
t biểu diễn số năm từ khi

0:00:39.750,0:00:41.260
Liam mở tài khoản.

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Vậy giả sử nó là 0 năm từ khi

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Liam mở tài khoản.

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Anh ấy sẽ có bao nhiêu nào?

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Anh ấy sẽ có 6250 đô đúng không.

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Đó là số tiền ban đầu của anh ấy.

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GIả sử giờ là 1 năm từ khi

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anh ấy mở tài khoản.

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Thế anh ấy sẽ có bao nhiêu?

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Vâng anh ấy sẽ có 6250 đô nhân,

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hãy viết nó theo cách này, cộng 20% của 6250.

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Nó tăng 20% mỗi năm.

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Nên đây là số tiền ban đầu

0:01:13.900,0:01:18.180
thêm với 20% của 6250 đô đó nữa.

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Nếu ta nhân phân phối 6250 ra, thì

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