Từ các chữ số 1,2,3,4,6,7,8 có thể lập bao nhiêu số 3 chữ số đôi một khác nhau và là số lẻ

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Ответ:

dinarussell74

10.05.2021

Mathematics

$\sum\limits_{i=3}^{10}\big i^2$

or:

$\sum\limits_{i=1}^{8}\left(2+i\right)^2$

or:

x₁=3, x₂=4, x₃=5, .... x₈=10

$\sum\limits_{i=1}^{8}\big x_i^2$

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