已知a=2008x+2006,b=2008x+2007,c=2008x+2008,求(a+b)的平方+(b-c) 的平方+(c-a) 的平方的值
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2008-11-15
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(a+b)^2+(b-c)^2+(c-a)^2
=(2008x+2006+2008x+2007)^2+(2008x+2006-2008x-2007)^2+(2008x+2008-2008x-2006)^2
设2006=n
则:
(2008x+2006+2008x+2007)^2+(2008x+2006-2008x-2007)^2+(2008x+2008-2008x-2006)^2
=[(n+2)x+n+(n+2)x+n+1]^2+[(n+2)x+n-(n+2)x-(n+1)]^2+[(n+2)x+(n+2)-(n+2)x-n]^2
=[2(n+2)x+2n+1]^2+1^2+2^2
=(2nx+4x+2n+1)^2+1+4
=(4016x+4013)^2+5
=16128256x^2+32232416x+16104169+5
=16128256x^2+32232416x+16104174
=(2008x+2006+2008x+2007)^2+(2008x+2006-2008x-2007)^2+(2008x+2008-2008x-2006)^2
设2006=n
则:
(2008x+2006+2008x+2007)^2+(2008x+2006-2008x-2007)^2+(2008x+2008-2008x-2006)^2
=[(n+2)x+n+(n+2)x+n+1]^2+[(n+2)x+n-(n+2)x-(n+1)]^2+[(n+2)x+(n+2)-(n+2)x-n]^2
=[2(n+2)x+2n+1]^2+1^2+2^2
=(2nx+4x+2n+1)^2+1+4
=(4016x+4013)^2+5
=16128256x^2+32232416x+16104169+5
=16128256x^2+32232416x+16104174
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