[2+ 1/27-(7/9- 1 1/ 12+ 1/6)*36]*0.25=(2+ 1/27-7*4+ 1 1*3-6)* 1/4=28/27* 1/4=7/27

[( 1+9)*9/2]*2-9=9*9=8 1

Fourth and fifth, 100 and n are replaced.

(39+55/57)/(-20) =-(40-2/57)/20 =-2+1/570 =-1and 569/570.