Bonsoir,
A)
4/3 -5/2 = 8/6 - 15/6 = - 7/6
- 2/3 +3/4 = - 8/12 + 9/12 = 1/12
-7/6 * 12/1 = - 84/6 = -14
B)
4/3 -5/2*-3/2+3/4
= 4/3 + 15 /4 + 3/4
= 4/3 + 18/4
= 4/3 + 9/2
= 8/6 + 27/6
= 35/6