помогите решить дроби=5/48-1/12,5/12-5/18,1/14-1/21,3/26-4/39.

5/48 - 1/12 = 5/48 - 4/48 = 1/485/12 - 5/18 = 15/36 - 10/36 = 5/361/14 - 1/21 = 3/42 - 2/42 = 1/423/26 - 4/39 = 9/78 - 8/78 = 1/78