CHỨNG TỎ RẰNG S=1/2^2 + 1/2^4 +1/2^6 +1/2^8 +......+1/2^2020+1/2^2022 < 1/5

CHỨNG TỎ RẰNG S=1/2^2 + 1/2^4 +1/2^6 +1/2^8 +......+1/2^2020+1/2^2022 < 1/5
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