原式=1-1/2+1/2-1/3+1/3-1/4 +1/10-1/11=1-1/11=10/11
1/1x2+1/2x3+1/3x4+1/4x5+…+1/10x11
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1/1x3+1/2x4+1/3x5+1/4x6+...+1/10x12