已知函数f(x)={x²-4,0≤x≤2;2x,x>2,则f(2)=?'若f(x0)=8,则x0=?
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已知函数f(x)={x²-4,0≤x≤2;2x,x>2,则f(2)=?'若f(x0)=8,则x0=?
已知函数f(x)={x²-4,0≤x≤2;2x,x>2,则f(2)=?'若f(x0)=8,则x0=?
已知函数f(x)={x²-4,0≤x≤2;2x,x>2,则f(2)=?'若f(x0)=8,则x0=?