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pttquyen2128
2 năm trước
B1) Có 1 miếng đất hình chữ nhật có chiều rộng 15m, chiều dài 24m. người ta dựng cọc để làm hàng rào, 2 cọc liên tiếp cách nhau 3m. hỏi để rào hết miếng đất thì cần phải có mấy cọc. B2) Muốn lên tầng 3 của một ngôi nhà cao tầng phải đi qua 52 bậc thang.Vậy phải đi qua mấy bậc thang để đến tầng 6 ngôi nhà này. Biết rằng bậc thang của mỗi tầng là như nhau?
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