factoriser au maximum et réduir merci d'avance : ps ^ = puissance de 1) 70a - 21 2) x² - 4 x 3) 18b^4 - 18b² 4) 9x² - 3x + 6 5) 10x³ + 5x 6) ( 16x - 49 ) ² - ( 4x - 25 ) ² 7) x² - 2x + 1 + ( 3x + 4 ) ( x - 1 ) 8) ( 2√5 - 3 ) ( √3 + √5 ) - ( √3 + √5 )² 9) (1-√2) ( 5√2 + 3 ) + ( 1 - √2 ) ²
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