|2/1-1|=|5/1-3/1|=|4/3-5/4|=

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|2/1-1|=|5/1-3/1|=|4/3-5/4|=
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|2/1-1|=|5/1-3/1|=|4/3-5/4|=
|2/1-1|=
|5/1-3/1|=
|4/3-5/4|=

|2/1-1|=|5/1-3/1|=|4/3-5/4|=
分子分母写反了吧,如果是写反了的话,以下是答案
1、1/2
2、2/15
3、1/20

巧算：(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4+1/5+1/6)-(1+1/2+1/3+1/4+1/5+1/6)*(1/2+1/3+1/4+1/5)(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4+1/5+1/6)-(1+1/2+1/3+1/4+1/5+1/6)*(1/2+1/3+1/4+1/5)===== 1 2 3 4 5=1 1()2()3()4()5=1 1+1-2+3-4+5=? (1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*(1+1/4)*(1-1/4)*(1+1/5)*(1-1/5)=? 1+1=?还有1+2+3+4+5=? 1+2+3-4-5+1+1+2+3= 1-1/2+1/3-1/4+1/5-1/6+1/7.-1/50=? |2/1-1|=|5/1-3/1|=|4/3-5/4|= 1/1*2+1/2*3+1/3*4+1/4*5+.+1/39*40=? 1/1*2+1/2*3+1/3*4+1/4*5+.+1/2004*2005=? 1/1*2+1/2*3+1/3*4+1/4*5+^+1/199*200=? 1/4-1/5=1/18+1/6=1/2-1/8=7/11+5=1/3+1/4=2-1/3= 1=5 2=1 5 3=2 1 5 4=3 2 1 5 5=? 3+1/2+1/3+1/4+5=? 1+2=3 4+5=? 1/1*3+1/2*4+1/3*5+1/4*6+.+1/100*102=? 1-1/2+1/3-1/4+1/5-1/6+…+1/15=23*[1/( )+1/( )+1/( )+1/( )]