T
tuanstung


giup to nha:
Cho A=1/2^2+1/3^2+1/4^2+...1/2011^2+1/2012^2.Chung to A ko phai số nguyên
lam duoc thi to cam on
Cho A=1/2^2+1/3^2+1/4^2+...1/2011^2+1/2012^2.Chung to A ko phai số nguyên
lam duoc thi to cam on
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