a=2000x+1999,b=2000x+ 2000,c=2000x +2001,求a^2+ b^2 +c^2-ab-bc-ac

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a=2000x+1999,b=2000x+2000,c=2000x+2001,求a^2+b^2+c^2-ab-bc-aca=2000x+1999,b=2000x+2000,c=2000x+2001,求

a=2000x+1999,b=2000x+ 2000,c=2000x +2001,求a^2+ b^2 +c^2-ab-bc-ac
a=2000x+1999,b=2000x+ 2000,c=2000x +2001,求a^2+ b^2 +c^2-ab-bc-ac

a=2000x+1999,b=2000x+ 2000,c=2000x +2001,求a^2+ b^2 +c^2-ab-bc-ac
a=b-1,c=b+1.代入则为(b-1)^2+b^2+(b+1)^2-(b-1)*b-b*(b+1)-(b-1)*(b+1)=3