13*(3.69-1.8)+1.11*0.13用简便计算

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13*(3.69-1.8)+1.11*0.13用简便计算

13*(3.69-1.8)+1.11*0.13用简便计算
13*(3.69-1.8)+1.11*0.13用简便计算

13*(3.69-1.8)+1.11*0.13用简便计算
=0.13*(369-180)+0.13*1.11
=0.13*(189+1.11)
=0.13*(190+0.11)
=1.3*19+0.13*0.11
=24.7+0.0143
=24.7143

13*(3.69-1.8)+1.11*0.13
=1.3*(36.9-18)+1.3*0.111
=1.3*(18.9+0.111)
=1.3*19.011
=24.7143