There are 90 Egyptian scores: one half, one third, one ninety-one. Pick out five and add a sign to make their sum equal to minus one

There are 90 Egyptian scores: one half, one third, one ninety-one. Pick out five and add a sign to make their sum equal to minus one

-(1/2+1/3+1/9+1/27+1/54)
1/2+1/4+1/6+1/18+1/36=1
1/2+1/4+1/9+1/12+1/18=1
1/2+1/5+1/6+1/10+1/30=1

Pick out 10 numbers in 1 / 2,3 / 1,1 / 4.1/91 and add the sign to make the sum equal to - 1

-(1/3+1/9+1/15-1/90)-(1/4+1/6+1/12)+1/7-1/8-1/56=-1

90 Egyptian numbers have 90 Egyptian numbers 1 / 2, 1 / 3,..., 1 / 90, 1 / 91. Choose nine of them and add the sign to make them equal to - 1!
(see! It's nine! And equals - 1!

-1/2-1/3-1/5-1/6+1/10+1/15+1/20-1/30+1/60=-1

Select 10 Egyptian numbers and add a sign to make their sum equal to - 1

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