曲线y=x3+2x-1在点M(1,2)处的切线方程是A.5x-y-3=0 B.

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问题 曲线y=x3+2x-1在点M(1,2)处的切线方程是A.5x-y-3=0B.x-5y-3=0C.5x+y-3=0D.x+5y-3=0

选项 A.5x-y-3=0
B.x-5y-3=0
C.5x+y-3=0
D.x+5y-3=0

答案 A

解析
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