[Đại 6] Xin mời giải giùm

H

huongngoclan250291

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T

trieuthanhbinh

[TEX]A= 2+2^2+....+2^{50}[/TEX]
[TEX] = 2.(2+1) + 2^3.(2+1) +.....+ 2^{49}.(2+1)[/TEX]
[TEX] =3.(2+2^3+2^5+...+ 2^{49})[/TEX] [TEX]\vdots[/TEX] [TEX]3[/TEX] [TEX](dpcm)[/TEX]
 
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