65432.1*123456-65432.2*123455=

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65432.1*123456-65432.2*123455=

65432.1*123456-65432.2*123455
=65432.1*123456-(65432.1+0.1)*(123456-1)
=65432.1*123456-65432.1*123456-123456*0.1+65432.1*1+0.1
=65432.1-12345.6+0.1
=53086.6