Cho khai triển $(1+x+x^2+x^3+...+x^{10})^{11}=a_{0}+a_{1}x+a_{2}x^2+...+a_{110}x^{110}$. Chứng minh rằng :
$C_{11}^{0}a_{0}-C_{11}^{1}a_{1}+C_{11}^{2}a_{2}-... ...-C_{11}^{11}a_{11}=11$
Edited by thienminhdv, 24-12-2013 - 16:08.
Cho khai triển $(1+x+x^2+x^3+...+x^{10})^{11}=a_{0}+a_{1}x+a_{2}x^2+...+a_{110}x^{110}$.
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Started By thienminhdv, 24-12-2013 - 16:07
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