Verified answer

а) 5 цілих 1/4 : 4 цілих 7/8  =  5 1/4 : 4 7/8 = 21/4 : 39/8 = 21/4 * 8/39 =

    = 168/156 = 84/78 = 14/13 = 1 1/13.

б)  5 цілих 5/8 : 2 цілих 1/4​  =  5 5/8 : 2 1/4 = 45/8 : 9/4 = 45/8 * 4/9 =

    = 180/72 = 20/8 = 10/4 = 5/2 = 2 1/2 = 2 5/10 = 2,5.