已知函数f(x)=2x+1/(2-x)+a在区间(-1,1)内有零点,试问f(x)有几个零点?证明结论,求a取值范围
人气：271 ℃ 时间：2020-03-25 08:12:29
解答
(1)f(x)=2x+1/(2-x)+a在区间(-1,1)内有零点
则 f(-1)*f(1)
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