8 / 9 * [3 / 4 - (10 / 19-1 / 4)] is easy to operate and can be calculated by disjunction

8 / 9 * [3 / 4 - (10 / 19-1 / 4)] is easy to operate and can be calculated by disjunction

8/9*[3/4-(10/19-1/4)]
=8/9*[3/4+1/4-10/19]
=8/9*9/19
=8/19
It's all fractions