(8-2.75)/2.5+1.09=[(8-2.75)*4]/[2.5*4]+1.09=(32-11)/10+1.09=2.1+1.09=3.19 22.6-5.4*0.4= 22.6-2.16=21 42.41+34.5/(14.75-12.25)= 42.41+34.5/2.5= 42.41+(34.5*4)/(2.5*4)= 42.41+138/10= 42.41+13.8=56.21
用简便方法计算下面各题(8-2.75)/2.5+1.09 22.6-5.4*0.4 42.41+34.5/(14.75-
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