25 * 6.4 * 12.5 2 / 3 - 1 / 6 = 3 / 4 + 1 / 8 = 6 / 7 + 7 / 9 - 6 / 7 + 7 / 9

25 * 6.4 * 12.5 2 / 3 - 1 / 6 = 3 / 4 + 1 / 8 = 6 / 7 + 7 / 9 - 6 / 7 + 7 / 9

25 * 6.4 * 12.5
= 25 * 0.4 * 2 * 0.8 * 12.5
= 10 * 2 * 10
= 200.
2 / 3 - 1 / 6 = 4 / 6 - 1 / 6 = 3 / 6 = 1 / 2.
3 / 4 + 1 / 8 = 6 / 8 + 1 / 8 = 7 / 8.
6 / 7 + 7 / 9 - 6 / 7 + 7 / 9 = 14 / 9.