Additional score 150 points! ~ mathematical emperor to answer! About the score to find the law! Challenge the limit! Kneel` 1 × 1 / 3 = 1 / 2 * (1-1 / 3), 3 × 1 / 5 = 1 / 2 * (1 / 3-1 / 5), 5 × 1 / 7 = 1 / 2 * (1 / 5-1 / 7) It can be calculated according to the observation: 1 × 1 / 3 + 3 × 1 / 5 + 5 × 1 / 7 + +2009 × 2011 1 / 2 =? (urgent, kneel down, tonight! Tell me the law, write down the law in the form of algebra! And the answer) good answer, timely answer, add score 200!

Additional score 150 points! ~ mathematical emperor to answer! About the score to find the law! Challenge the limit! Kneel` 1 × 1 / 3 = 1 / 2 * (1-1 / 3), 3 × 1 / 5 = 1 / 2 * (1 / 3-1 / 5), 5 × 1 / 7 = 1 / 2 * (1 / 5-1 / 7) It can be calculated according to the observation: 1 × 1 / 3 + 3 × 1 / 5 + 5 × 1 / 7 + +2009 × 2011 1 / 2 =? (urgent, kneel down, tonight! Tell me the law, write down the law in the form of algebra! And the answer) good answer, timely answer, add score 200!

Let me tell you the answer first, (1) 2011-3 = 2008, 2008 divided by 2 = 1004, 1004 multiplied by half = 502, 502 * (1-1 / 2011) this is the supplementary rule of the answer