题目内容
A.-x+y+1=0 B.x+y-3=0 C.x-y+1=0 D.x+y-1=0
解析:k==1,
∴切线方程为y-1=x-2,
即x-y-1=0.
答案:A
A.-x+y+1=0 B.x+y-3=0 C.x-y+1=0 D.x+y-1=0
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