已知:1/1×2=1-1/2,1/2×3=1/2-1/3.计算:1/1×2+1/2×3+1/3×4+···+1/99×1
3个回答
原式
=1/1-1/2+1/2-1/3+1/3···+1/99-1/100
=1-1/100
=99/100
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