1/2+5/6+11/12+19/20+29/30…………+89/90
来源:百度知道 编辑:UC知道 时间:2024/06/17 00:34:03
过程!快!
原式=1-1/2+1-1/6+1-1/12+……+1-1/90
=-(1/1*2+1/2*3+1/3*4+……+9*10)+9
=-(1-1/2+1/2-1/3+1/3-1/4+……+1/9-1/10)+9
=81/10
算式=(1-1/2)+(1-1/6)+(1-1/12)+…………+(1-1/72)+(1-1/90)
=(1-1/2)+(1-(1/2-1/3))+(1-(1/3-1/4)+…………+(1-(1/8-1/9))+(1-(1/9-1/10))
=(1*9)-(1-1/2+1/2-1/3+1/3-1/4…………+1/8-1/9+1/9-1/10)
=9-9/10
=81/10=8.1
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=