Tolong dijawab sekarang soalnya mau dikumpulkan besok. Tolong di jawab yaaaa......

4. a. 3/8 - 1/4
        = 3/8 - 2/8
        = 1/4
    b. 7/30 + 3/20 - 17/4
        = 14/60 + 9/60 - 255/60
        = -232/60
   c. 22/3 - 55/8 = 176/24 - 165/24
                           = 11/24
   d. 4/9 + 11/18 + 5/27 - 14/3 = 24/54 + 33/54 + 10/27 - 126/27
                                                  = 67/27 - 126/27
                                                  = -59/27