(8 + 2/3) - 7 / (1 + 1/4)
= (8 + 2/3) - 7 / (4/4 + 1/4)
= (8 + 2/3) - 7 / (5/4)
= (8 + 2/3) - 7 * 4/5
= (8 + 2/3) - 28/5
= (8 + 2/3) - (25/5 + 3/5)
= (8 + 2/3) - (5 + 3/5)
= 8 + 2/3 - 5 - 3/5
= 8 - 5 + 2/3 - 3/5
= 3 + 10/15 - 9/15
= 3 + 1/15
Die Lösung ist 3 1/15