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calculati suma:S=7+13+19+.....+601


Răspuns :

S=7+13+19+.....+601
Aflam cati termeni are suma:
(601 - 7) :6 + 1 = 594:6+1 = 99+1=100
S = (7+601) × 100 : 2
S = 608 × 50
S = 30 400