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【单选题】
设函数f（x）=x 3 +2f'（1）x 2 +1，则函数f（x）在（1，f（1））处的切线方程是（ ）A.
x+y-1=0
B.
x-y+1=0
C.
x-y-1=0
D.
x+y+1=0
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举一反三
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