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trubacgioi75
2 năm trước
Một cái khăn trải bàn hình thoi có độ dài đường chéo thứ nhất là 18dm, đường chéo thứ hai ngắn hơn đường chéo thư nhất 6dm. Tính diện tích cái khăn trải bàn đó? Mong mn giúp đỡ nha!!!!!!!
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