Subtract. Express each difference in simplest form.
1.7/12-2/4 = ???
2. 4/5-1/3=
3. 1-5/6-1/12=
4. 7/9-1/6=
1.7/12-2/4 = ???
2. 4/5-1/3=
3. 1-5/6-1/12=
4. 7/9-1/6=