1) Escreva na forma reduzida cada um dos seguintes polinômios:
A) 3a³ - 2a + 5a³ - 4a³ - 3a
B) 7x² - 6x + 9 +2x - 5x² - 8
C) 3a + 8ab + 5b - 2ab - 7a + b - ab
D) (- 3a + 9x) + (5x - 6y)
E) (x - 7a) - (x - 9a)
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