题目内容
设函数f(x)在(-∞，+∞)上有定义，在区间[0，2]上，f(x)=x(x2-4)．若对任意的x都满足f(x)=kf(x+2)，其中k为常数． (1) 写出f(x)在[-2，0]上的表达式． (2)问k为何值时，f(x)在x=0处可导．
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