Question

(3/7-16/21)-2 1/7 сколько будет скажите пж

Answer 1

= 3/7 - 16/21 - 2 1/7 = 9/21 - 16/21 - 2 3/21 = 9/21 - 2 19/21 = - 2 10/21

Answer 2

1) 3/7-16/21=3*3/7*3-16/21=9/21-16/21= -7/21= -1/3.
2) -1/3*2 1/7= -1/3*15/7= -15/21= -5/7.
Ответ: -5/7.