Question

Помогите пожалуйста

Answer 1

1) 2-1 9/11 = 2/11
2) 3 1/7•2/11 = 4/7
3) 4/7:8/21 = 3/2 = 1 1/2
4) 2-1 1/2 = 1/2 = 0,5