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(1/2-1)+(1/3-1/2)+(1/4-1/3)+...+(1/100-1/99)
=-(1-1/2)-(1/2-1/3)-(1/3-1/4)-...-(1/99-1/100)
=-[(1-1/2)+(1/2-1/3)+(1/3-1/4)+...+(1/99-1/100)]
=-(1-1/2+1/2-1/3+1/3-1/4+...+1/99-1/100)
=-(1-1/100)
=-99/100
=-(1-1/2)-(1/2-1/3)-(1/3-1/4)-...-(1/99-1/100)
=-[(1-1/2)+(1/2-1/3)+(1/3-1/4)+...+(1/99-1/100)]
=-(1-1/2+1/2-1/3+1/3-1/4+...+1/99-1/100)
=-(1-1/100)
=-99/100
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