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Sagot :

Bonjour,

101 = 100 + 1  donc (100 + 1)² = 100² + 2 * 100 + 1 .

1 001 = 1 000 + 1  donc (1 000 + 1)² = 1 000² + 2 * 1 000 + 1 .

99 = 100 - 1  donc 99² = (100 - 1)² = 100² - 2 * 100 + 1.

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