Bonsoir j'ai besoin d' aide c'est pour un DM de maths 123²- (122-1)² - (121-2)² + (120-3)²

12²- (11-1)² - (10-2)² + (9-3)² =4

45²- (44-1)² - (43-2)² + (42-3)² =4

merci
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