Question

помогите прошу номер 15

Answer 1

1)(3/4+1/5)×5/19=19/20×5/19 = 1/4
2)(12 1/3 - 7 3/4)×6/11=4 7/12 × 6/11 = 2 1/2
3)(2 3/5 - 5/8) : 19 3/4= 1 39/40 : 19 3/4 = 1 /10