cho A 1/2+1/2 mũ 2 +1/2 mũ 3 +1/2 mũ 64

1 bình luận về “cho A 1/2+1/2 mũ 2 +1/2 mũ 3 +1/2 mũ 64”

1. Ta có: A = 1/2 + 1/2^2 + 1/2^3 + … + 1/2^{64}

   2A = 2. (1/2 + 1/2^2 + 1/2^3 + … + 1/2^{64})

   2A = 1 + 1/2 + 1/2^2 + … + 1/2^{63}

   2A – A = (1 + 1/2 + 1/2^2 + … + 1/2^{63}) – (1/2 + 1/2^2 + 1/2^3 + … + 1/2^{64})

   A = 1 – 1/2^{64}

   Vậy: A = 1 – 1/2^{64}

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