tolong kerjakan no4 .a,b,c,d

a. 3/8-1/4 = 3/8-2/8= 1/8
b. 7/30+3/20-4 1/4 = 7/30+3/40-17/4=14/60+9/60-255/60= - 58/60= -3 13/15
c. 7 1/3-6 7/8 = 22/3 -55/8 = 176/ 24 - 165/24 =11/24
d. 4/9+11/18+5/27- 4 2/3 = 4/9 + 11/18 +5/27 - 14/3 = 24/54+33/54+10/54-252/54= –185/54= –3 23/54