5/2+23.4+11.1*57.6+6.54*28
=2.5+23.4+576+57.6+5.76+6.54*28
=576+57.6+23.4+5.76+2.5+183.12
=576+81+8.26+183.12
=848.38
基本上没什么简算,有那功夫不如直接算