简便计算:20-2/3-2/15-2/35-2/63-2/99

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/04 13:54:58
简便计算:20-2/3-2/15-2/35-2/63-2/99

简便计算:20-2/3-2/15-2/35-2/63-2/99
简便计算:20-2/3-2/15-2/35-2/63-2/99

简便计算:20-2/3-2/15-2/35-2/63-2/99
20-2/3-2/15-2/35-2/63-2/99
=20-(1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11)
=20-(1-1/11)
=20-10/11
=19又1/11

上式=20-(1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11)
=20-(1-1/11)
=20-10/11
=210/11