已知
,
且
,那么下列不等式:①
;②
;③
;④
中,正确的序号是________ .
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21-22高一下·陕西西安·期中 查看更多[3]
陕西省西安市长安区第一中学2021-2022学年高一下学期期中数学试题(已下线)专题16 基本不等式-2022年暑假初三升高一数学衔接知识自学讲义(人教A版2019)(已下线)2.2 基本不等式(第2课时)(分层作业)-【上好课】
更新时间:2022-05-10 17:52:43
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【推荐2】托勒密是古希腊天文学家、地理学家、数学家,托勒密定理就是以其名字命名的重要定理,该定理原文:圆的内接四边形中,两对角线所包矩形的面积等于一组对边所包矩形的面积与另一组对边所包矩形的面积之和.其意思为:圆的内接凸四边形两组对边乘积的和等于两条对角线的乘积.从这个定理可以推出正弦、余弦的和差公式及一系列的三角恒等式,托勒密定理实质上是关于共圆性的基本性质.已知四边形
的四个顶点在同一个圆的圆周上,
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,
为正三角形,则
面积的最大值为___________ ;四边形
的面积为__________ .(注:圆内接凸四边形对角互补)
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【推荐1】如图,三棱锥
中,
两两垂直,
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【推荐1】长方、堑堵、阳马、鳖臑、这些名词出自中国古代数学名著《九章算术商功》,其中阳马和鳖臑是我国古代对一些特殊锥体的称呼.取一长方体,如图长方体
,按平面
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中
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的 体积为 ___________ .
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