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英语
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what are all values of x for which 4-x^2≥x-2?
人气：138 ℃ 时间：2020-05-24 04:28:19
解答
4-X^2》X-2
变换一下
X^2+X-6《0
（X+3)(X-2)《0
因此
-3《X《2
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