用简便计算,3.14*1.9+31.4*8.1

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用简便计算,3.14*1.9+31.4*8.1
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用简便计算,3.14*1.9+31.4*8.1
用简便计算,3.14*1.9+31.4*8.1

用简便计算,3.14*1.9+31.4*8.1
3.14*1.9+31.4*0.81
=31.4*0.19+31.4*0.81
=31.4*(0.19+0.81)
=31.4

你是不是写错了 有个小数点写错位置了啊

31.4
3.14*1.9+31.4*0.81
=31.4*0.19+31.4*0.81
=31.4*(0.19+0.81)
=31.4