2 3/4+26%-0,152= 21 3/4 + 5 2/5=

11/4 + 26/100 - 15,2/100 =
275/100 + 26/100 - 15,2/100
= 301/100 - 15,2/100 = 285,8/100
= 2,858

87/4 + 27/5
= 435/20 + 108/20 = 543/20
= 27,15