若a=2000x+2001,b=2000x+2002,c=2000x+2003.求a^2+b^2+c^-ab-ac-bc.

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若a=2000x+2001,b=2000x+2002,c=2000x+2003.求a^2+b^2+c^-ab-ac-bc.

若a=2000x+2001,b=2000x+2002,c=2000x+2003.求a^2+b^2+c^-ab-ac-bc.
若a=2000x+2001,b=2000x+2002,c=2000x+2003.求a^2+b^2+c^-ab-ac-bc.

若a=2000x+2001,b=2000x+2002,c=2000x+2003.求a^2+b^2+c^-ab-ac-bc.
a^2+b^2+c^-ab-ac-bc.
=1/2[(a-b)^2+(b-c)^2+(a-c)^2]
=1/2[1+1+4]
=3