2 1 per 4 - 1 per 2 =

2 1/4 - 1/2
9/4 - 1/2
9/4 - 2/4
= 7/4
= 1,75

2 1/4 - 1/2
= 2 1/4 - 2/4
= 9/4 - 2/4
= 7/4 = 1 3/4

Jadikan jawaban tercerdas ya.