Calcule:
a) (a² + ab - bc) + (b² - ab - ac)
b) (2ab - 5a - b) - (- 3ab + 6a - b)
c) x . (x - 5) . (x + 3)
d) (- 9x² + 81x²y² - 45xy²) : (- 9xy)
Por favor me ajudem nessas contas ^^
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