1、(1+1/2+1/3+1/4)*(1/2+1/3+1/4+1/6)-(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4)=( )
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(1+1/2+1/3+1/4)*(1/2+1/3+1/4+1/6)-(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4)
=(1+1/2+1/3+1/4)*(1/2+1/3+1/4)+(1+1/2+1/3+1/4)*(1/6)
-(1+1/2+1/3+1/4)*(1/2+1/3+1/4)-(1/5)*(1/2+1/3+1/4)
=(1+1/2+1/3+1/4)*(1/6)-(1/5)*(1/2+1/3+1/4)
=25/72-13/60
=47/360
这题前面那个1/6应该是1/5,这样的话结果是1/5
=(1+1/2+1/3+1/4)*(1/2+1/3+1/4)+(1+1/2+1/3+1/4)*(1/6)
-(1+1/2+1/3+1/4)*(1/2+1/3+1/4)-(1/5)*(1/2+1/3+1/4)
=(1+1/2+1/3+1/4)*(1/6)-(1/5)*(1/2+1/3+1/4)
=25/72-13/60
=47/360
这题前面那个1/6应该是1/5,这样的话结果是1/5
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