a=-2004 b=2003 c=-2002 a^2+b^2+c^2+ab+bc-ac
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![a=-2004 b=2003 c=-2002 a^2+b^2+c^2+ab+bc-ac](/uploads/image/z/1586765-29-5.jpg?t=a%3D-2004+b%3D2003+c%3D-2002+a%5E2%2Bb%5E2%2Bc%5E2%2Bab%2Bbc-ac)
a=-2004 b=2003 c=-2002 a^2+b^2+c^2+ab+bc-ac
a=-2004 b=2003 c=-2002 a^2+b^2+c^2+ab+bc-ac
a=-2004 b=2003 c=-2002 a^2+b^2+c^2+ab+bc-ac
a^2+b^2+c^2+ab+bc-ac
=1/2*[(a+b)^2+(a-c)^2+(b+c)^2]
=1/2*(1+4+1)
=3
a^2+b^2+c^2+ab+bc-ac
=[(a+b)^2+(b+c)^2+(a-c)^2]/2
=[(-1)^2+1^2+(-2)^2]/2
=6/2
=3
a=-2004 b=2003 c=-2002
a^2+b^2+c^2+ab+bc-ac
=a(a+b)+b(b+c)+c(c-a)
=2004+2003-2*2002
=3
a^2+b^2+c^2+ab+bc-ac
=[(a+b)^2+(b+c)^2+(a-c)^2]/2
=(1+1+4)/2
=3
a^2+b^2+c^2+ab+bc-ac=1/2[(a+b)²+(b+c)²+(a-c)²]=1/2[(-1)²+1+(-2)²]=3.