Bonjour
( 2 - √ 7 ) ² = 2² - 2*2*√7 + √ 7²
= 4 - 4 √ 7 + 7
= 11 - 4 √ 7
Bonne journée
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Bonjour
( 2 - √ 7 ) ² = 2² - 2*2*√7 + √ 7²
= 4 - 4 √ 7 + 7
= 11 - 4 √ 7
Bonne journée