摘要：(西南师大附中高2009级第三次月考)已知 (1)若p > 1时.解关于x的不等式, (2)若对时恒成立.求p的范围． 解:(1) ······················································································ 1分 ①········································ 3分 ② p = 2时.解集为····················································· 5分 ③ p > 2时.解集为··········································· 7分 (2) ··········································································· 8分 ∴ 恒成立 ∴ 恒成立······································ 9分 ∵ 上递减·················································· 10分 ∴ ················································································ 11分 ∴ p > 2 ·································································································· 12分
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，
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成等比数列，
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的通项公式；
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步上完，共有
种不同方法．(用数字作答)
的焦点作一条直线与抛物线相交于
两点，且
，则这样的直线有
，则下列不等式成立的是
