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  2. A.2x-y+2=0 B.2x+y+1=0 C.2x+y-3=0 D.2x

A.2x-y+2=0 B.2x+y+1=0 C.2x+y-3=0 D.2x

最全题库2022-08-02  31

问题 A.2x-y+2=0B.2x+y+1=0C.2x+y-3=0D.2x-y+3=0

选项 A.2x-y+2=0
B.2x+y+1=0
C.2x+y-3=0
D.2x-y+3=0

答案 D

解析 提示:对y求导,代入x=-1得到切线斜率k=2,把x=-1代入曲线方程得交点(-1,1),利用点斜式写出切线方程。
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