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(1+2+3+.......500)×x-123,4=3701,6

Răspuns :

Pt suma 1+2+3....n avem formula n(n+1)/2
Deci 1+2+3+....500=500×501/2=250×501/2
250×501X-123,4=3701,6
250×501x=3701,6+123,4
125250x=3825
X=3825/125250=0,03053