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:y′=x,y′|x=2=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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