=7/8+3/8- 1/4

=7/8+ 1/8+ 1/4- 1/4

= 1+0

= 1

2.65438+3 out of 00+15 out of 0/4 out of 5.

=9/30+28/30+24/30

=(9+28+24)/30

=6 1/30

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.

Baidu encyclopedia-fractional subtraction