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設方程為Ax+By+Cz+D=0 A-B+C+D=0 B-3C+D=0 A+B+C= 0 => 2B-D=0 => D=2B =>C=(B+D)/3 => C=B A=-(B+C)=> A=-2B 取B=-1 則A=2、B=-1、C=-1、D=-2 ∴平面方程2x-y-z-2=0為所求.
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