(2000-x+ x-1998)( (2000-x)^2-(2000-x)(x-1998)+ (x-1998)^2)=8
( (2000-x)^2-(2000-x)(x-1998)+ (x-1998)^2)=4
( (2000-x)^2+2(2000-x)(x-1998)+ (x-1998)^2-3(2000-x)(x-1998))=4
( (2000-x+x-1998)^2-3(2000-x)(x-1998))=4
(4-3(2000-x)(x-1998))=4
3(2000-x)(x-1998)=0
2000=x 或 x=1998
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