factorisé au maximum et réduire :ps : ^ = puissance de a) 70a - 21        b) 18b^4 - 18b²  c) 9x²- 3x + 6     d) 10x³ + 5x e) (16x - 49 )² - (4x -25 ) f ) x² - 2x + 1 + (3x + 4 ) ( x - 1 ) g) (2√5 - 3 ) ( √3 + 5 ) - (√3 + √5 )² h) ( 1 - √2 ) ( 5√2 + 3 ) + ( 1 - √2)²
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