{75.5-【26.5-（4又20分之3 - 3.5 + 1又4分之1）÷1.9】}-18
={75.5-【26.5-（4.15-3.5+1.25）÷1.9】}-18
={75.5-【26.5-1.9÷1.9】}-18
={75.5-【26.5-1】}-18
={75.5-25.5}-18
=50-18
=32