bjr
A = 3√54 - 7√6 - √2 x √12
= 3√9 x √6 - 7 √6 - √2 x √4 x √3
= 9√6 - 7√6 - 2√6 = 0
B = (√7)² - (√11)² = 7 - 11 = -4
puisque (a+b) (a-b)² = a² - b²
C = 1 + 2√5 + 5 - 2√5 = 6
puisque (a+b)² = a² + 2ab + b²
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bjr
A = 3√54 - 7√6 - √2 x √12
= 3√9 x √6 - 7 √6 - √2 x √4 x √3
= 9√6 - 7√6 - 2√6 = 0
B = (√7)² - (√11)² = 7 - 11 = -4
puisque (a+b) (a-b)² = a² - b²
C = 1 + 2√5 + 5 - 2√5 = 6
puisque (a+b)² = a² + 2ab + b²