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f'x=3x^2-8x+2y=0 f'y=2x-2y=0-->x=y,代入式:3x^2-6x=0, x=0or2,y=0or2 A=f"xx=6x-8 C=f"yy=-2 B=f"xy=2 x=0,y=0,A=-2,B=2,C=-2,AC-B^2=-8*(-2)-4=12>0,A
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