简便计算:20-2/3-2/15-2/35-2/63-2/99
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/14 15:33:02
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](/uploads/image/z/475104-48-4.jpg?t=%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%EF%BC%9A20-2%2F3-2%2F15-2%2F35-2%2F63-2%2F99)
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
=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