4.65×3.2+4.65×7.6-0.8×645的简便方法?
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4.65X3.2十4.65X7.6一0.8X645
=4.65X10.8一0.8x645
=46.5十46.5X0.8一0.8X645
=46.5一0.8X598.5
=46.5一480十12
=一421.5
=4.65X10.8一0.8x645
=46.5十46.5X0.8一0.8X645
=46.5一0.8X598.5
=46.5一480十12
=一421.5
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