1/1X3+1/3X5+1/5x7+1/7+9+…+1/49x51=?

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1/1X3+1/3X5+1/5x7+1/7+9+…+1/49x51=?
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1/1X3+1/3X5+1/5x7+1/7+9+…+1/49x51=?
1/1X3+1/3X5+1/5x7+1/7+9+…+1/49x51=?

1/1X3+1/3X5+1/5x7+1/7+9+…+1/49x51=?
1/1X3+1/3X5+1/5x7+1/7+9+…+1/49x51
=1/2*(1-1/3+1/3-1/5+1/5-1/7+...+1/49-1/51)
=1/2*(1-1/51)
=25/51

25/51