1 * 3:1 + 3 * 5:1 + 5 * 7:1 + 7 * 9:1 + 9 * 11:1 + 11 * 13:1 =? It's easy, Mian

1/3+3/5+5/7+7/9+9/11
=3/3+5/5+7/7+9/9+1/11
=
This problem can exchange all the numerators of fractions so that they can make up four 1s and one 1 / 11
4 and 1 / 11 + 11 / 13 = 4.0897324897325

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