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1x3/1+3x5/1+5x7/1+……+17x19/1

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0.5x(1-1/3+1/3-1/5+1&#...

1×3/1+3×5/1+5x7/1+……十17x19/1 =1/2×(1-1/3)+1/2×(1/...

裂项相消

1x3+3x5+5x7+7x9+...+17x19 =(2-1)*(2+1)+(4-1)*(4+1...

0.5x(1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+....+1/17-1/19+...

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