The answer process is as follows:

(1) 5/6 minus 5/6 is a subtraction with the same denominator, and it can be directly subtracted without division.

(2) Subtraction with the same denominator, with the denominator unchanged and the numerator reduced.

(3) Five-sixths minus five-sixths can be written as: 5/6-5/6=(5-5)/6=0/6=0.

If there is a fraction x/y, so that the sum of x/y and c/d is equal to a/b, then x/y is called the difference between fractions a/b and c/d, and it is recorded as: a/b-c/d = x/y. Fractional subtraction can only be performed when the minuend is not less than the minuend, and the result is unique.

Two fractions a/b and c/d, if a/b≥c/d, there is a difference (ad-cb)/bd, which is unique. For example: 2/3= 1/2+ 1/6, then 1/6=2/3- 1/2.

Extended data:

The algorithm of fractional subtraction is:

1. Subtract the fraction with the denominator, the denominator remains unchanged, and the difference obtained by molecular subtraction is taken as the numerator of the difference.

2. Fractions with different denominators are subtracted, first divided into fractions with the same denominator, and then operated according to the subtraction rules with the same denominator.

3. Subtraction by Fractions: First, turn each fraction into a false fraction, then divide it into fractions with the same denominator, then use the fractions with the same denominator to operate according to the law of subtraction, and finally turn the difference into fractions or integers.

4. If the difference is not the simplest score, it should be differentiated into the simplest score.

Fractions are either finite decimals or infinite cyclic decimals, and infinite acyclic decimals like π cannot be replaced by fractions.

When the numerator and denominator are multiplied or divided by the same number (except 0), the fractional value will not change. Therefore, each score has an infinite number of equal parts. Using this property, we can be on and off.