Question

1-5/6+7/12-9/0+11/0-13/2+15/6-17/2简便计算

Answer 1

你的题目好像打丢了几数字.

1-5/6+7/12-9/20+11/30-13/42+15/56-17/72

=1-1/2-1/3+1/3+1/4-1/4-1/5+1/5+1/6-1/6-1/7+1/7+1/8-1/8-1/9

=1-1/2-1/9

=7/18