(1/1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+.+(1/199-1/200)=1/1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+.+1/199-1/200=1-1/200=199/200
1 1 1 1 1 —— + —— +—— + —— + …… + ———— 1x2 2x3 3x4 4x5 199x2
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相关问题
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1 1 1 1 1—+ —+ —+ —+...+ ——1X2 2X3 3X4 4X5 199X200
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