3/5x5+3/5x8+……+3/1997x2000+3/2000x2003 /是分号
问题描述：
3/5x5+3/5x8+……+3/1997x2000+3/2000x2003 /是分号
答
3/5x5+3/5x8+……+3/1997x2000+3/2000x2003 =3（1/5x5+1/5x8+……+1/1997x2000+1/2000x2003 ）=3[1/25+(1/5-1/8)+(1/8-1/11)+……+(1/1997-1/2000)+(1/2000-1/2003) ]=3(1/25+1/5-1/8+1/8-1/11+……+1/1997-1/2000+1...