1) Aplicando a regra do produto da soma pela diferença de dois termos (a+b)×(a-b)=a²-b². calcule:
A) (x-2)×(x+2)
B) (5x+2y)×(5x-2y)
C) (y²+4a)×(y²-4a)
D) (8a-1)×(8a+1)
E) (x elevado a 5 + y³)×(x elevado a 5 - y³)
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