大分子=1/1-1/2+1/3-1/4+1/5-1/6+.+1/99-1/100
大分母=1/51+1/52+.+1/100+(1/1+1/2+1/3+.+1/50)--(1/1+1/2+1/3+.+1/50)
=1/51+1/52+.+1/100+(1/1+1/2+1/3+.+1/50)--(1/2乘以2+1/4乘以2+1/6乘以2+.+1/100乘以2)=1/51+1/52+.+1/100+(1/1+1/2+1/3+.+1/50)--2*(1/2+1/4+1/6+...+1/100)=1/1+1/2+1/3+.+1/50+1/51+1/52+.+1/100-(1/2+1/4+1/6+...+1/100)-(1/2+1/4+1/6+...+1/100)=1/1+1/3+1/5+...+1/99--(1/2+1/4+1/6+...+1/100)=1/1-1/2+1/3-1/4+...+1/99-1/100
所以大分母=大分子 所以原式=1
(1/1*2+1/3*4+1/5*6+1/7*8+...+1/99*100)/(1/51+1/52+...+1/100)
(1/1*2+1/3*4+1/5*6+1/7*8+...+1/99*100)/(1/51+1/52+...+1/100)
数学人气:127 ℃时间:2019-12-01 18:27:48
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