9999 = 100 - 80 + 9 20 = 2099999 = (99 + 9) / 11 - 9 = 9999 = 99 / (9 + 9) = 9999 = (9 + 9) (9 + 9) = 90
9999 = 100 - 80 + 9 20 = 20
99999 = (99 + 9) / 11 - 9 = 9
999 = 99 / (9 + 9) = 9
999 = (9 + 9) (9 + 9) = 90