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QN=259 Tỷ lệ giữa lao động phức tạp và lao động giản đơn tăng lên có ảnh hưởng như thế nào đến lượng giá trị được tạo ra trong một đơn vị thời gian?a. Tăng lênb. Giữ nguyên không thay đổic. Giảm xuốngd. Tăng lên nhưng phải gắn với tiến bộ công nghệ

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