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luongquangmanh
2 năm trước
a .chứng minh phân số B= 2n+1 /6n+1 tối giản ở mọi số nguyên n b.cho A = 10^2016 +1 /10^2017 : B=10^2017+1 /10^2018+1 khi so sánh A với B c .cho A= 1/2^2 +1/3^3 +......+1/100^2 . chứng minh : A< 1 ai trả lời hết vote 5 sao
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