There are 90 Egyptian numbers, there are 90 Egyptian numbers, 1 / 2, 1 / 3, 1 / 4,..., 1 / 90, 1 / 91. Choose ten of them and add the sign to make them equal to - 1

There are 90 Egyptian numbers, there are 90 Egyptian numbers, 1 / 2, 1 / 3, 1 / 4,..., 1 / 90, 1 / 91. Choose ten of them and add the sign to make them equal to - 1

-1/5-1/6-1/8-1/9-1/10-1/12-1/15-1/18-1/20-1/24=-1
-1/2-1/6-1/12-1/20-1/30-1/42-1/56-1/72-1/90-1/10=-1