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【简答题】
已知x为实数,试比较x 3 +1与x 2 -x+2的大小。 12. 已知不等式 |x - 2| < a ( a > 0 )的解集为 {x ∈ R| - 1 < x < c} ,求 a+2c 的值。
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举一反三
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