0.65×10.9×6.5简便方法
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0.65*10.9*6.5
=4.225*10.9
=4.225*(10+1-0.1)
=42.25+4.225-0.4225
=46.475-0.4225
=46.0525
=4.225*10.9
=4.225*(10+1-0.1)
=42.25+4.225-0.4225
=46.475-0.4225
=46.0525
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