CHứng minh: C=1/2^2 + 1/4^2 + 1/6^2 +………..+ 1/100^2 < 1/2

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1. `C=1/2^2 + 1/4^2 + 1/6^2 +………..+ 1/100^2 `

   `C=1/2^2(1+1/2^2+1/3^2+1/4^2+…+1/50^2)`

   `C<1/4(1+1/(1.2)+1/(2.3)+…+1/(49.50))`

   `C<1/4(1+1-1/2+1/2-1/3+…+1/49-1/50)`

   ` C<1/4(1+1-1/50)`

   `C<1/4(2-1/50)`

   `C<1/2-1/200`

   `C<1/2`

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