166又20分之1除以41
(166 + 1/20)÷41
= (164 + 2 + 1/20)÷41
= (164 + 40/20 + 1/20)÷41
= (164 + 41/20)÷41
= 164÷41 + 41/20÷41
= 4 + 1/20
等于4又20分之1