(1-1/2+1/3-1/4....+1/99-1/100)/(1/100x102+1/100x104+....+1/100x200)= 5
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分子=1-1/2+1/3-1/4+1/5-1/6……+1/99-1/100
=1+1/2+1/3+1/4+1/5+1/6……+1/99+1/100-2*(1/2+1/4+1/6+......+1/100)
=1+1/2+1/3+1/4+1/5+1/6……+1/99+1/100-(1+1/2+1/3+......+1/50)
=1/51+1/52+1/53+......+1/100
分母=1/102+1/104+1/106+......+1/200
=1/2*(1/51+1/52+1/53+......+1/100)
分子除分母=1/(1/2)=2
=1+1/2+1/3+1/4+1/5+1/6……+1/99+1/100-2*(1/2+1/4+1/6+......+1/100)
=1+1/2+1/3+1/4+1/5+1/6……+1/99+1/100-(1+1/2+1/3+......+1/50)
=1/51+1/52+1/53+......+1/100
分母=1/102+1/104+1/106+......+1/200
=1/2*(1/51+1/52+1/53+......+1/100)
分子除分母=1/(1/2)=2
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