Bài 1/124: Bạn Dung tính nhẩm 15% của 120 như sau: 10% của 120 là 12... 5% của 120 là 6... Vậy 15% của 120 là 18. Dựa theo cách tính nhẩm của bạn Dung hãy tìm 17,5% của 240 và 35% của 520. ( Nêu cách tính giống như bạn Dung) * Câu trả lời của bạ

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