用简便方法计算:6.9-4.5×0.8-0.4

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用简便方法计算:6.9-4.5×0.8-0.4
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用简便方法计算:6.9-4.5×0.8-0.4
用简便方法计算:6.9-4.5×0.8-0.4

用简便方法计算:6.9-4.5×0.8-0.4
6.9-4.5×0.8-0.4
=6.9-3.6-0.4
=6.9-4
=2.9