Вычислите 2-3 1/7*(2-1 9/11):8/21

Question

Вычислите 2-3 1/7*(2-1 9/11):8/21

Answer 1

2-1 9/11=2/11
3 1/7×2/11=22/7×2/11=4/7
4/7÷8/21=4/7×21/8=3/2=1 1/2
2-1 1/2=1/2