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1+ 1/1+2 + 1/1+2+3 +...+ 1/1+2+3+...+x = 200/100 , X apartine de N*

Răspuns :

Am demonstat in poza ca
[tex] \frac{2x}{x+1}= \frac{200}{101} \\ 202x=200x+200 \\x=100[/tex]
Vezi imaginea ALEX05OK