[100² + 200² + 300² + 400² + 500²] - [99² + 199² + 299² + 399² + 499²] =
(100² - 99²) + (200 - 199)² + (300 - 299)² + (400 - 399)² + (500 - 499)² =
199 + 399 + 599 + 799 + 999 = 200 + 400 + 600 + 800 + 1000 - 5 = 3000 - 5 = 2995
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[100² + 200² + 300² + 400² + 500²] - [99² + 199² + 299² + 399² + 499²] =
(100² - 99²) + (200 - 199)² + (300 - 299)² + (400 - 399)² + (500 - 499)² =
199 + 399 + 599 + 799 + 999 = 200 + 400 + 600 + 800 + 1000 - 5 = 3000 - 5 = 2995
pronto