7.5-2.38+1.5-1.62
=7.5+1.5-（2.38+1.62）
=9-4
=5
5.4*62+1.8*114
=1.8*186+1.8*114
=1.8*（186+114）
=1.8*300
=540
765*213/27+765*327/27
=765*（213+327）/27
=765*540/27
=765*20
=15300
4.83*0.59+0.41*0.59-0.324*5.9
=4.83*0.59+0.41*0.59-3.24*0.59
=(4.83+0.41-3.24)*0.59
=2*0.59
=1.18