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mdieu1801
2 năm trước
Chiều dài rễ của một cây bắp không kể lông hút là 650 m. Trung bình 1 mm chiều dài có 420 lông hút, chiều dài của một lông hút là 0,5 mm. Xác định tổng chiều dài các lông hút của a/ Một cây bắp b/ 1 ha bắt biết trồng trung bình 1500 cm vuông một cây I
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