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thuylinh2427
2 năm trước
Một thửa ruộng trồng lúa hình chữ nhật có độ dài 2 cạnh là x1; x2 với x1; x2 là 2 nghiệm của phương trình x2 – 80x + 1536 = 0. Không giải phương trình hãy tính ⦁ Số kg thóc thu hoạch được trên thửa ruộng đó biết trung bình 100 m2 thì được 80 kg thóc ⦁ Anh An muốn rào thửa ruộng bằng lưới B40 (loại 3,2 kg/m). Hỏi số tiền mua lưới kẽm là bao nhiêu mới đủ rào thửa ruộng biết trong quá trình làm bị hao hụt 5% so với số mét lưới chuẩn bị ban đầu do các mép nối ở đầu cột. Biết giá của lưới B40 là 19600 đồng/kg (làm tròn đến hàng nghìn)
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