Dados A= 2x² - 8x+7 , B= x² - 5x + 7 e C= 2x - 9 , calcule asDados A= 2x² - 8x+7 , B= x² - 5x + 7 e C= 2x - 9 , calcule as expressões a seguir: a)A + B + C
b)A - B - C
c) -5 B
b)A - B - C
c) -5 B
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