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calculati 35+36+37....420

Răspuns :

suma lui gauss
35+36+37...+420=420(420+1):2=
=88410
35+36+37....420
Suma =n(35+420):2, unde n = numarul termenilor
n=420-35+1=386 termeni
Suma =386(35+420):2
Suma=193x455
Suma=87815