ʱ : 四川省雅安市2017-2018学年高二下学期期末考试数学(?试题(解析? - 百度文库ϿʼĶ
17. ֪𰸡.
ڴмֵֵĵ.
:ɼֵõ:
ʱ
õݼ.
ٸݵȷ䣺ʱ
ĶΪ
ɵ Ȼ
ã
Ǽ
ʱ
ӶԵݼ.
ʱ
ĵ
ĵ
18. һι齱УijŽȯһȽȯţɻüֵüֵԪĽƷûнij˿ʹӴŽȯγţ 1ù˿нĸʣ 2ù˿ͻýƷֵܼΪ𰸡(1);(2).
Ԫĸ.
ԪĽƷжȽȯţÿſɻ
1ù˿ûнĸʣɴö¼ʼ㹫ʽù˿нĸʣ 2ùŵʹʽøù˿ͻýƷֵܼΪ⣺1øù˿ûнĸΪ
=
Ԫĸ.
ù˿нĸΪP=1=
ù˿нĸΪ ɵã PX=100=
=.
㾦(1)ŵ͵Ҫ˼¼ĵȿԣһҪעڼ¼¼Ļ¼ʱǷǵȿܵģ(2)оٷŵͣһֱ۵ĺ÷оʱ밴ijһ˳ظ©(3)עһԳȡγȡһԳȡ˳⣬γȡ˳. 19. ͼʾΪ
е.
Уƽ棬Ϊһ㣬ֱ
1֤2ƽ
ƽ
ɽǵֵ.
𰸡(1)2.
PA=AC=ABNΪABһ㣬AB=4ANDzPA=1ȻAΪԭ㣬ABACAPֱΪxyzռֱϵɴ˲ѵõ꣨1Ҫ֤CMSNǿҪ֤ɣ㣬Dz֤ 2Ҫƽ
ƽCMNɽǵĴСֻҪнǵķƽ
ƽCMNɽǵĴС
ƽCMNķ
нǣ֮Ĺϵƽ
⣺PA1AΪԭ㣬ABACAPֱΪxyzռֱϵ(ͼ) P(0,0,1)C(0,1,0)B(2,0,0) ANABMSֱΪPBBCе㣬
N(0,0)M(1,0)S(10)
(1)
(11)
(0)
(11)(0)0[Դ:ѧ..Z.X.X.K]
CMSN.
(1,0)a(xyz)ΪƽCMNһ
a0
a0.
ȡy1ã(2,12) ƽNBCķ
ΪƽNBCƽCMNɽ ƽNBCƽCMNɽǵֵΪ.
㾦ռ弸һ㲽ǣ1۲ͼΣǡĿռֱϵ2дӦ꣬Ӧֱߵķ3ӦƽķֱߴֱΪг4ռλùϵתΪϵ5ݶӦĽǺ;.
20. ijƿμԣӵУ͵⣩Żصȡ. 1ÿڵһγ鵽£ڶκ͵ξ鵽ĸʣ
2涨ƿ͵⣬ÿԼĸʾΪĸʾΪÿԵã.ָѳ鵽⣨͵⣩ֵܷķֲѧ. 𰸡1
2.
1ʹʽøÿڵһγ鵽£ڶκ͵ξ鵽ĸʣ2ȷXĿȡֵӦĸֵõķֲУõѧ
⣺1ǡÿڵһγ鵽⡱Ϊ¼Aÿڶκ͵ξ鵽⡱Ϊ¼B
Ըÿڵһγ鵽£ڶκ͵ξ鵽ĸΪ
2XĿȡֵΪ0,10,20,30
ķֲΪ
X P
0 10 20 30 ѧΪ
㾦ɢѧһ㲽Ϊ
һǡжȡֵжпȡֵԼȡÿֵʾ壻
ڶ:̽ʡϡöٷʹʽйŵʽθʽ¼ĸʺʽ¼ĸʻʽԼ¼ĸʹʽȣȡÿֵʱĸʣ
ǡдֲС淶ʽдֲУע÷ֲеʼķֲл¼ĸǷȷ IJǡֵһɢѧĶֵЩʵеܹ϶ijĵͷֲ(ֲXB(np))ֱֵͷֲʽ(E(X)np). 21. ͼ
Уƽ
ƽ
.
1ֱߣ2
ƽɽǵֵ.
ƽ
ڣ
ֵڣ˵.
Ƿڵ㣬ʹ
.
𰸡
ȡADеΪOCOPO֪ɵCOADPOADOΪԭ㣬ռֱϵP001B110D010C200һ
꣬
ƽPCDķPBƽPCDļнΪȣɽǵֵ
ֱPBƽPCD