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PufoseniePuff
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Calculati x din proportia:
[tex] \frac{x}{25025} [/tex]=[tex] \frac{1*2+2*3+3*4+...+2003*2004}{5*10+10*15+15*20+...+10015*10020} [/tex]

Răspuns :

Bunicaluiandrei
x/25025 = (1·2 +2·3 +......+2003·2004) / [5²(1·2 + 2·3 +......+2003·2004)]
x/25025 = 1/25    x = 25025 /25 = 1005

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