解题方法
1 . 随机变量X的取值为0、1、2,P(X=0)=0.2,DX=0.4,则P(X=1)=_____ ;若Y=2X,则DY=_____ .
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2020-04-21更新
|
297次组卷
|
2卷引用:2020届浙江省杭州市高三下学期4月统测模拟数学试题
2 . 若
的展开式中各项系数之和为3,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
__________ ;该展开式中的常数项为__________ (用数字作答).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11dabf4188fcee642834204668a488c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
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19-20高一·浙江杭州·期末
解题方法
3 . 《九章算术》中有这样的描述:“今有城下广四丈,上广二丈,高五丈,袤四丈”,其中“广”是东西走向的意思,“袤”是南北走向的意思.若有几何体的三视图如图,则该几何体的体积为_________ ,表面积为________ (不需填单位).
![](https://img.xkw.com/dksih/QBM/2020/4/20/2445448635613184/2445642378780672/STEM/6cdba8fbcf4b4603af59c18140203691.png?resizew=164)
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4 . 已知多项式
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
________ ;若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a19e9a31265c8e28799466b2d8bbc45.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c28d33d196af9620ef81d73907fc74bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16c8d0474f7d81ef8dbefaacfd5afe7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb82c7fc6f89a9a265608247b39f4f1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a19e9a31265c8e28799466b2d8bbc45.png)
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解题方法
5 . 在
中,
的平分线交
于点
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
________ ;若
是
的外接圆圆心,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1204e73cda78d8d10d54f793c7e83063.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42c783a2c0e6c5c93c30b85dd67a92c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1204e73cda78d8d10d54f793c7e83063.png)
![](https://img.xkw.com/dksih/QBM/2020/4/20/2445448635613184/2445642378805248/STEM/e766445eb8dd42b6a74a1c9714744abb.png?resizew=137)
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6 . 已知圆锥
的底面半径、高、体积分别为2、3、
,圆柱
的底面半径、高、体积分别为1、
、
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffb70883828ee231b42167ca909d4f96.png)
_________ ,圆锥
的外接球的表面积为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2bc5e50b8dfa02601c70822252854a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffb70883828ee231b42167ca909d4f96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2bc5e50b8dfa02601c70822252854a.png)
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2020-04-18更新
|
321次组卷
|
3卷引用:2020届全国100所名校最新高考模拟示范卷模拟测试试题(一)
解题方法
7 . 居民老张年初将50万元资金投入银行购买理财产品
和
,其中理财产品
是高风险高收益产品,年收益率10%,预期收益不低于2万元;理财产品
风险低,收益也较低,年收益率5%,预期收益不低于1万元.则老张购买理财产品![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
_________ 万元时,一年后所获得的投资总收益最大?最大收益是________ 万元.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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名校
8 . 在天文学中,天体的明暗程度可以用星等或亮度来描述.若两颗星的星等与亮度满足
.其中星等为
,星的亮度为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef1c7229e345be3a4857b91d27126c88.png)
.
若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee7289212a15cec8bb1f04238b8a0cbc.png)
________ ;
若太阳的星等是
,天狼星的星等是
,则太阳与天狼星的亮度的比值为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6aadc24f02798d79b3855da6c20a2bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9369d6e6f9022be0f24b7e0c7f86d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef1c7229e345be3a4857b91d27126c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77344b02d4675a91cccd9d553540a27c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/861a46defcee786b358faf9a11ff1735.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee7289212a15cec8bb1f04238b8a0cbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2fa8a3b0794f34fbda5410dbc99e2e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/203b4c1b97dcb87dacb9fc636699f86e.png)
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解题方法
9 . 数列
满足
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfc875ca919921e8f63a6fca648561b.png)
_____ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/561235c288ba8fa41852f831ef3ad85c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfc875ca919921e8f63a6fca648561b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
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名校
解题方法
10 . 已知
,数列
为等差数列,公差
,
为数列
前
项和,若满足
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
_____ ;![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e64c50878350cd3bc2223faf988b66c.png)
_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb13dfa5fd853f10326b6b71f9ae144f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4ce64685821c3e55c07f151996ca8c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27e595839a406c5937b52f652e6a818e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e64c50878350cd3bc2223faf988b66c.png)
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