因为11.75-4又20分之3+2又4分之1-0.35=11.75+2.25-4.15-0.35=14-4.5=9.5
所以：
125.875/中括号11.75-4又20分之3+2又4分之1-0.35中括号
＝125.875/9.5
=25.175/1.9
=251.75/19
=10+61.75/19
=10+3+4.75/19
=13+0.2+0.95/19
=13.2+0.05
=13.25