7.4-0.15*2.8要简便 21.36/0.8-12.9要简便 4*(1.5+0.25)要简便

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7.4-0.15*2.8要简便 21.36/0.8-12.9要简便 4*(1.5+0.25)要简便

7.4-0.15*2.8要简便 21.36/0.8-12.9要简便 4*(1.5+0.25)要简便
7.4-0.15*2.8要简便 21.36/0.8-12.9要简便 4*(1.5+0.25)要简便

7.4-0.15*2.8要简便 21.36/0.8-12.9要简便 4*(1.5+0.25)要简便
7.4-0.15*2.8=7.4-0.15*(3-0.2)=7.4-(0.15*3+0.15*0.2)=7.4-(0.45+0.03)=6.98
21.36/0.8-12.9=(22-0.64)/0.8-(13-0.1)=22/0.8-0.64/0.8-(13-0.1)=27.5-0.8-13-0.1=13.6
4*(1.5+0.25)=4*1.5=0.25*4=6+1=7