f(x)={x2,x≤1ax−1,x>1f(x)=\begin{cases}x^{2},&x\leq1\\ax - 1,&x > 1\end{cases}f(x)={x2,ax−1,x≤1x>1在x=1x = 1x=1处连续，则a=a=a=（ ）.
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