có 4 sách toán, 3 sách lí, 3 sách hoá được xếp trên một giá sách nằm ngang.Hỏi số cách xếp sách tùy ý thứ tự các quyển sách?
số cách xếp ba quyển sách hoá nằm cạnh nhau?
Số cách xếp sao cho các sách cùng bộ môn nằm cạnh nhau?
Số cách sắp xếp sao cho hai sách toán nằm hai đầu giá...
Đọc tiếp
có 4 sách toán, 3 sách lí, 3 sách hoá được xếp trên một giá sách nằm ngang.Hỏi số cách xếp sách tùy ý thứ tự các quyển sách?
số cách xếp ba quyển sách hoá nằm cạnh nhau?
Số cách xếp sao cho các sách cùng bộ môn nằm cạnh nhau?
Số cách sắp xếp sao cho hai sách toán nằm hai đầu giá sách
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Mn giúp em với cần gấp!!!