1/2+5/6+11/12+...111221/111222
来源:百度知道 编辑:UC知道 时间:2024/05/26 05:00:06
1/2+5/6+11/12+...+111221/111222=
原式=1-1/2+1-1/6+1-1/12+...+1-1/111222
=(1+1+1+...+1)(333个)-(1/2+1/6+1/12+...+1/111222)
=333-1/(1*2)-1/(2*3)-1/(3*4)+...-1/(333*334)
=333-(1-1/2+1/2-1/3+1/3-1/4+...+1/333-1/334)
=333-(1-1/334)
=332+1/334
=110889/334
裂项
原式=333-(1/2+1/6+1/12+...+1/111222)=333-(1-1/2+1/2-1/3+1/3-1/4+...+1/333-1/334)=333-333/334=332又1/334
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1/6,1/3,1/2,——,5/6,——
1/(2/3)/(3/4)/(4/5)/(5/6)/(6/7)/(7/8)
1/2+1/3+1/4+1/5+1/6+....+1/n=?
1/2+1/3+1/4+1/5+1/6+...+1/100怎么算?
1/2+1/3+1/4+1/5+1/6+...+1/n=?
(2/1+3/1+4/1+5/1)乘(2/1+3/1+4/1+5/1+6/1)减(2/1+3/1+4/1+5/1+6/1)乘(2/1+3/1+4/1+5/1)等于多少
1/2+(1/4+3/4)+(1/6+3/6+5/6)+....+(1/98+3/98+....+97/98)
急!!!!!!1/2+3/2+5/6+7/8+................+199/200
1+1/2+1/3+1/4+1/5+1/6+1/7+1/8+......+1/100 = ?
1/1+(2/1-1/2)+(3/1-2/2+1/3)+(4/1-3/2+2/3-1/4)+...+(9/1-8/2+7/3-6/4+5/5-4/6+3/7-2/8+1/9=