What is the sum of the three largest fractional units

What is the sum of the three largest fractional units

1/2+1/3+1/4=13/12

1 / 6 = 1 / () + 1 () 1 / 10 = 1 / () + 1 () 1 / 15 = 1 () + 1 () divide these fractions into the sum of different fractional units

Is it true that 1 / 6 = (1 / 12) + (1 / 12) 1 / 10 = (1 / 20) + (1 / 20) 1 / 15 = (1 / 30) + (1 / 30)?

Divide the sixth into the sum of ten fractional units

1/6=1/12+1/24+1/48+1/96+1/192+1/384+1/768+1/1536+1/2560+1/3840

Split 1 / 10 and 1 / 15 into the difference of two fractional units

1 / 10 to 1 / 5-1 / 10
1 / 15 to 1 / 5-2 / 15