bjr
(x-3)² - 25 = (x-3)² - 5² = (x-3 + 5) (x-3 -5) = (x+2) (x-8)
puisque a² - b² = (a+b) (a-b)
4/5 + 1/5x2/3 =
4/5 + 2/15
= (4x3) / (5x3) + 2/15
= 12/15 + 2/15
= b
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bjr
(x-3)² - 25 = (x-3)² - 5² = (x-3 + 5) (x-3 -5) = (x+2) (x-8)
puisque a² - b² = (a+b) (a-b)
4/5 + 1/5x2/3 =
4/5 + 2/15
= (4x3) / (5x3) + 2/15
= 12/15 + 2/15
= b