bjr
on se sert de (a+b) (a-b)² = a² - b²
donc
C = 8 / (√6 + 2) = 8 (√6 - 2) / (√6 + 2) (√6 - 2)
= 8 (√6 - 2) / (√6)² - 2²
= 8√6 - 16 / 6 - 4
= 8√6 - 16 /2
= 4√6 - 8
idem pour d
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bjr
on se sert de (a+b) (a-b)² = a² - b²
donc
C = 8 / (√6 + 2) = 8 (√6 - 2) / (√6 + 2) (√6 - 2)
= 8 (√6 - 2) / (√6)² - 2²
= 8√6 - 16 / 6 - 4
= 8√6 - 16 /2
= 4√6 - 8
idem pour d