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Să se calculeze suma 1+2²+2³+...+2 la puterea a9a.

Răspuns :

 

[tex]\displaystyle\bf\\1+2+2^2+2^3+...+2^9=\\\\=2^0+2^1+2^2+2^3+...+2^9=\frac{2^{9+1}-1}{2-1}=\\\\=\frac{2^{10}-1}{1}=1024-1=\boxed{\bf1023}[/tex]