Réponses

Meilleure réponse !
2014-09-15T16:44:56+02:00
1°) (- 2/ 3x + 5/3 ) ( - 2/ 7x - 5/3 )
= 4/21x² +10/9x - 10/21x - 25/9
= 36/189x² + 210/189x - 90/189x - 525/189
= 36x² + 210x - 90x - 525
= 36x² + 120x - 525


2°) x ( x + 1 ) ( - x + 2 )

= x (-x² + 2x - x + 2)
= - x³ + 2x² - x² + 2x
= - x³ + x²+ 2x