bonsoir
1 ) 6 x² + 12 x - 15 x - 30 = 6 x² - 3 x - 30
2 ) - 5 x + 20 x² + 1 - 4 x = 20 x² - 9 x + 1
3 ) 2 x² - 16 x ³ - 1 + 8 x = - 16 x³ + 2 x² + 8 x - 1
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bonsoir
1 ) 6 x² + 12 x - 15 x - 30 = 6 x² - 3 x - 30
2 ) - 5 x + 20 x² + 1 - 4 x = 20 x² - 9 x + 1
3 ) 2 x² - 16 x ³ - 1 + 8 x = - 16 x³ + 2 x² + 8 x - 1