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ducanh6702
2 năm trước
Để đánh máy vi tính một bản thảo xong trong 12 ngày thì mỗi ngày phải đánh được 10 trang. Muốn đánh bản thảo đó xong trong 8 ngày thì mỗi ngày phải đánh được bao nhiêu trang? gấp x n lần
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