Your question is not clear. Are you asking, 'What is 3 - .25?'
If so, the answer is 1.75.
By the way .25 is the same as 1/4
If you are asking 'What is 3 - 1 and then over 4?', then the answer is .5 or 1/2.
3/4 minus 1/6 is 7/12
3/4 minus 1/5 is 11/20
7/12 minus 1/3 = 1/4
3 4/7 minus 1/7 is 3 3/7
-1/4
4/3 minus (-3/8) is 1 17/24
7/9 minus 3/4 is 1/36
5/6 minus 3/4 is 1/12
4/8 minus 1/8 is 3/8.
It is: 4/5 minus 1/2 = 3/10
negative 4 over 3 .
11/3 − 3/4 = 7/12