How to calculate 7 / 8 to 3 / 4 to 1 / 8?

How to calculate 7 / 8 to 3 / 4 to 1 / 8?

Using the exchange method, the original formula is 7-8-1-4-3
=6 / 8-3 / 4
=3 / 4-3 / 4
=0
o(∩_ ∩) O hope to adopt it!