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(2011 · Anhui simulation) if the point P (1,1) is the midpoint of the chord Mn with circle (x-3) 2 + y2 = 9, then the linear equation of the chord Mn is () A. 2x+y-3=0B. x-2y+1=0C. x+2y-3=0D. 2x-y-1=0
The equation is Y-1 = 2 (x-1), that is, 2x-y-1 = 0
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