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【简答题】
已知：函数f（x）＝x －bx＋3，且f（0）＝f（4）。 （1）求函数y＝f（x）的零点，写出满足条件f（x）<0的x的集合； （2）求函数y＝f（x）在区间[0，3]上的最大值和最小值。
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truth;
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