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- 3 1/7×(2-1 9/11)÷8/21=2/1¬7-22/7¬1×(2/1¬1-20/11¬1):8/21=14-22/7×(22-20/11)÷8/21=-8/7×2/11=-16/7÷21/8=-6