Tính
$T=-\frac{C^1_n}{2.3}+\frac{C_n^2}{3.4}-\frac{C^3_n}{4.5}+...+\frac{(-1)^n.C^n_n}{(n+1)(n+2)}$
$P=C^0_{2020}+4.C^4_{2020}+8.C^8_{2020}+...+2020.C^{2020}_{2020}$
$P=C^0_{2020}+4.C^4_{2020}+8.C^8_{2020}+...+2020.C^{2020}_{2020}$
Started By Element hero Neos, 16-09-2017 - 20:34
#2
Posted 18-09-2017 - 13:40
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Trung sĩ
Tính
$T=-\frac{C^1_n}{2.3}+\frac{C_n^2}{3.4}-\frac{C^3_n}{4.5}+...+\frac{(-1)^n.C^n_n}{(n+1)(n+2)}$
$P=C^0_{2020}+4.C^4_{2020}+8.C^8_{2020}+...+2020.C^{2020}_{2020}$
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