Question

[Lê Thủy Vân]

So sánh : A=\(\left(\frac{1}{2^2}\right).\left(\frac{1}{3^2}\right).\left(\frac{1}{4^2}\right)....\left(\frac{1}{2013^2}\right).\left(\frac{1}{2014^2}\right)\)

B = \(-\frac{1}{2}\)

Answer 1

[Trần Đức Thắng]

Vì \(\frac{1}{2^2}>0\)

 ............

 \(\frac{1}{2014^2}>0\)

=> A = \(\left(\frac{1}{2^2}\right)\left(\frac{1}{3^2}\right)...\left(\frac{1}{2014^2}\right)>0\)

B = \(-\frac{1}{2}