大一高数复习资料题求证明有无限对互异数可以证明r^r=s^s

一到空间解析几何题,求教:已知两个直线r和s,问1.证明两直线平行,并求出两直线所在平面2.求出两直线间的距离3.给一点P(2,0,1)在直线r上,写一个过P点,且以r,s为切线的圆_百度作业帮
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一到空间解析几何题,求教:已知两个直线r和s,问1.证明两直线平行,并求出两直线所在平面2.求出两直线间的距离3.给一点P(2,0,1)在直线r上,写一个过P点,且以r,s为切线的圆
一到空间解析几何题,求教:已知两个直线r和s,问1.证明两直线平行,并求出两直线所在平面2.求出两直线间的距离3.给一点P(2,0,1)在直线r上,写一个过P点,且以r,s为切线的圆
1、r的方向向量为:(1,2,1)s的方向向量为:(1,-1,1)×(1,0,-1)=(1,2,1)两直线方向向量相同,因此平行;2、在r上取一点(2,0,1),过(2,0,1)作垂直于r的平面,该平面法向量就是r的方向向量,则平面方程为:(x-2)+2(y-0)+(z-1)=0,即:x+2y+z-3=0,求该平面与s的交点,即解方程组:x+2y+z-3=0x-y+z-2=0x-z=0解得交点为:(7/6,1/3,7/6)两点间距离:√[(2-7/6)²+(0-1/3)²+(1-7/6)²]=√30/6,就是两直线距离3、圆心为两点(2,0,1)和(7/6,1/3,7/6)的中点:(19/12,1/6,13/12)半径为√30/12,则球方程为:(x-19/12)²+(y-1/6)²+(z-13/12)²=5/24下面求过这两条直线的平面方程,(2,0,1)与(1,0,1)在该平面上相减得平面上的一个向量:(1,0,0),已知向量(1,2,1)在平面上则该平面的法向量为:(1,0,0)×(1,2,1)=(0,-1,2)因此平面方程为:-(y-0)+2(z-1)=0,即-y+2z-2=0因此所求圆的方程组为:(x-19/12)²+(y-1/6)²+(z-13/12)²=5/24-y+2z-2=0数字比较怪,不知有没算错,你自己也算算,方法是对的.希望可以帮到你,如果解决了问题,请点下面的"选为满意回答"按钮,(P-q)^(r-s)^(非q v 非s)-非p v 非r 这是什么推理形式.用命题演算证明该推理.构造符合该推理形式_百度作业帮
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(P-q)^(r-s)^(非q v 非s)-非p v 非r 这是什么推理形式.用命题演算证明该推理.构造符合该推理形式
(P-q)^(r-s)^(非q v 非s)-非p v 非r 这是什么推理形式.用命题演算证明该推理.构造符合该推理形式
用p'表示非p,p-q=p∧q',原式=p∧q'∧r∧s'∧(q'∨s')∧(p'∨r')'=p∧r∧(q'∨s')∧p∧r(吸收律,德-摩根律)=p∧r∧(q'∨s').高一数学题(集合)对任意x,y∈S,若x+y∈S,x-y∈S,则称S对加减封闭,S为R的真子集证明:若S1,S2为R的两个真子集,且对加减封闭,则必存在c∈R,使得c∉S1∪S2.求详细解答_百度作业帮
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高一数学题(集合)对任意x,y∈S,若x+y∈S,x-y∈S,则称S对加减封闭,S为R的真子集证明:若S1,S2为R的两个真子集,且对加减封闭,则必存在c∈R,使得c∉S1∪S2.求详细解答
高一数学题(集合)对任意x,y∈S,若x+y∈S,x-y∈S,则称S对加减封闭,S为R的真子集证明:若S1,S2为R的两个真子集,且对加减封闭,则必存在c∈R,使得c∉S1∪S2.求详细解答
证明:(1)若对任意x∈S1都有x∈S2,即S1包含于S2,那么S1∪S2=S2为R的真子集,故必存在c∈R使c∉S1∪S2(2)若S2包含于S1,同理可证存在c∈R使c∉S1∪S2(3)若上述两种情况都不成立,即存在x∈S1使x∉S2,且存在y∈S2使y∉S1,那么考虑x+y∈R,若它属于S1,则应有y=(x+y)-x属于S1,矛盾!因此它不属于S1.同理它不属于S2,因此x+y∉S1∪S2,得证.
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香港特别行政区法院对国防、外交等国家行为无管辖权。香港特别行政区法院在审理案件中遇有涉及国防、外交等国家行为的事实问题,应取得行政长官就该问题发出的证明文件,上述文件对法院有约束力。行政长官在发出证明文件前,须取得中央人民政府的证明书。
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Hong Kong S.A.R. Court no jurisdiction over acts of State such as defence and Foreign Affairs. Hong Kong S.A.R. in the adjudication of cases, the Court in case of questions of fact involving acts of State such as defence and Foreign Affairs, shall obtain a certificate from the Chief Executive in res
Hong Kong S.A.R. Court no jurisdiction over acts of State such as defence and Foreign Affairs. Hong Kong S.A.R. in the adjudication of cases, the Court in case of questions of fact involving acts of State such as defence and Foreign Affairs, shall obtain a certificate from the Chief Executive in res
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Hong Kong Special Administrative Region Court to national behaviors and so on the national defense, diplomacy does not have the jurisdiction.Hong Kong Special Administrative Region Court meets in the trying case has involves national behavior and so on the national defense, diplomacy fact questions,
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& Close your eyes. Clear your heart. Let it go 闭上您的眼睛。 清除您的心脏。 让它去 &离散数学命题证明题 前提:p→s,q→r,p∨q,┘r 结论:r 求证明过程_好搜问答
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离散数学命题证明题 前提:p→s,q→r,p∨q,┘r 结论:r 求证明过程
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