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Sagot :

Salut,

je suppose qu'il faut factoriser....

J = (x-3)(x-2) + 5(x-3)

  = (x-3)(x-2+5)

  = (x-3)(x+3)

K = 3(5-9x) + (5-9x)(1-3x)

  =  (5-9x)(3+1-3x)

  = (5-9x)(4-3x)

L = (3x-1)² - 16

  = (3x-1)² - 4²

  = (3x-1+4)(3x-1-4)

  = (3x+3)(3x-5)

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