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"Lại lần nữa" để làm lại bài tương tự.[br]"Next" để làm câu tiếp theo.[br]"Start" để làm lại từ đầu.[br]"Lời giải" để xem lời giải hoặc hướng dẫn.[br]Di chuyển đơn vị trong đồ thị để phóng lớn, thu nhỏ.