将1拆成5个不同分数单位之和是多少,
问题描述：
将1拆成5个不同分数单位之和是多少,
答
1=1/2+1/6+1/12+1/20 +1/5
1=(1/1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+1/5=1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+1/5