脱式计算:654321*123456-654322*123455

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脱式计算:654321*123456-654322*123455
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脱式计算:654321*123456-654322*123455
脱式计算:654321*123456-654322*123455

脱式计算:654321*123456-654322*123455
原式=654321×123455+654321-654322×123455
=(654321-654322)×123455+654321
=654321-123455
=530866

原式=654321*(123455+1)-(654321+1)*123455
=654321*123455+654321-654321*123455-123455
=654321-123455
=530866