On a square paperboard with side length of 1, paste small pieces of paper with the area of half, quarter, eighth, sixteenth and twentieth power in turn. Please write down the expression of the area of the last part not pasted

On a square paperboard with side length of 1, paste small pieces of paper with the area of half, quarter, eighth, sixteenth and twentieth power in turn. Please write down the expression of the area of the last part not pasted

1 minus one-half minus one-quarter minus one eighth minus one sixteenth minus one. One tenth power of minus 20 is equal to one tenth power of 20