[3.75-(0.2+3分之1)*4又2分之1]-13.5%

问题描述:

[3.75-(0.2+3分之1)*4又2分之1]-13.5%

=[3.75-(0.2+3分之1)*9/2]-13.5%
=3.75-0.9-3/2-0.135
=2.85-1.5-0.135
=1.215