已知函數(shù)
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是
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上的偶函數(shù),對(duì)于
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都有
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成立,且
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,當(dāng)
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且
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時(shí),都有
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,則給出下列命題:
①
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;②函數(shù)
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圖象的一條對(duì)稱軸為
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;③函數(shù)
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在
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上為減函數(shù);④ 方程
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在
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上有4個(gè)根 ,上述命題中的所有正確命題的序號(hào)是
.(把你認(rèn)為正確命題的序號(hào)都填上)
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科目:高中數(shù)學(xué)
來(lái)源:不詳
題型:解答題
(14分)命題p:關(guān)于
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的不等式
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,
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恒成立;
命題q:函數(shù)
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是增函數(shù),
若命題
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是真命題,求實(shí)數(shù)
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的取值范圍.
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科目:高中數(shù)學(xué)
來(lái)源:不詳
題型:填空題
有下列命題:
①命題“
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”的否定是“
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”;
②設(shè)p、q為簡(jiǎn)單命題,若“
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”為假命題,則“
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為真命題”;
③“
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”是“
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”的充分不必要條件;
④若函數(shù)
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為偶函數(shù),則
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;
其中所有正確的說(shuō)法序號(hào)是
。
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科目:高中數(shù)學(xué)
來(lái)源:不詳
題型:單選題
已知
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,則下列推證中正確的是
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題型:單選題
設(shè)兩個(gè)平面
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、
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、直線
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,下列三個(gè)條件 ①
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②
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∥
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③
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若以其中兩個(gè)做為前題,另一個(gè)做為結(jié)論,則可構(gòu)成三個(gè)命題,這三個(gè)命題中正確的個(gè)數(shù)是
A 3個(gè) B 2個(gè) C 1個(gè) D 0個(gè)
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科目:高中數(shù)學(xué)
來(lái)源:不詳
題型:單選題
設(shè)命題
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的充要條件,命題
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,則( )
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科目:高中數(shù)學(xué)
來(lái)源:不詳
題型:單選題
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題型:填空題
已知命題①:函數(shù)
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為奇函數(shù);命題②:函數(shù)
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在其定義域上是增函數(shù);命題③:“
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”
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的逆命題;命題④:已知
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“
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”是“
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”成立的充分不必要條件,上述命題中,真命題的序號(hào)有
。(請(qǐng)把你認(rèn)為正確命題的序號(hào)都填上)。
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科目:高中數(shù)學(xué)
來(lái)源:不詳
題型:填空題
給出以下命題,其中正確命題序號(hào)為
。
a、若函數(shù)y=f(x)為偶函數(shù),則函數(shù)y="f" (x-1)的圖像關(guān)于直線x="1" 對(duì)稱;
b、“
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”是“
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”的充分不必要條件;
c、函數(shù)y=
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的反函數(shù)為
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其中x>-1;
d、已知
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是函數(shù)
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的導(dǎo)函數(shù),若
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=0,則
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必為函數(shù)的極值點(diǎn);
e、某城市現(xiàn)有人口a萬(wàn)人,預(yù)計(jì)人口年平均增長(zhǎng)率為p。那么該城市第十年年初的人口總數(shù)為
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萬(wàn)人
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