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(x+1)+(x + 2) +…+ (x + 24) = 348

Răspuns :

avem 24 paranteze⇒24 de x

suma lui Gauss

S=1+2+...+ n

S= n*(n+1)/2

(x+1)+(x + 2) +…+ (x + 24) = 348

24x+1+2+...+24=348

24x+ 24*25/2=348

24x+12*25=348

24x=348-300

24x=48

x=48/24

x=2