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p(x,y),R(x1,2x1-6) 由RA向量=2AP向量,得(1-x1,6-2x1)=2(x-1,y) 得1-x1=2x-2,得x1=3-2x 6-2x1=2y,得x1=3-y 則3-2x=3-y得y=2x
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