1/1998+2/1998+3/1998+......1998/1998求解

来源:百度知道 编辑:UC知道 时间:2024/05/12 10:05:15

=(1+2+3+4.......+1998)/1998
=1998(1+1998)/2/1998
=1997001/1998
=999.5

1/1998+2/1998+3/1998+......1998/1998
=(1+2+...+1998)/1998
=1998*(1998+1)/(2*1998)
=1999/2

原式=1/1998×(1+2+3+4+……+1998)
=1/1998×(1+1998)×1998/2
=1/2×1999=1999/2

=(1+2+……+1998)/1998
=【(1+1998)*1998】/2/1998
=1999/2
=999.5

1/1998+2/1998+3/1998+......1998/1998=(1+2+……+1998)/1998={[(1+1998)/2]*1998}/1998=1999/2

原式=(1+2+3+……+1997)/1998+1
=[(1+1997)*1997/2]/1998+1
=1997/2+1
=999.5