2.19+6.48+0.52-1.38-5.48-0.62(用简便方法计算,

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2.19+6.48+0.52-1.38-5.48-0.62(用简便方法计算,
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2.19+6.48+0.52-1.38-5.48-0.62(用简便方法计算,
2.19+6.48+0.52-1.38-5.48-0.62(用简便方法计算,

2.19+6.48+0.52-1.38-5.48-0.62(用简便方法计算,
2.19+6.48+0.52-1.38-5.48-0.62
=2.19+0.52+6.48-5.48-1.38-0.62
=2.71+(6.48-5.48)-(1.38+0.62)
=2.71+1-2
=1.71