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新教材精创1.4.1用空间向量研究直线、平面的位置关系(1)A基础练(解析版)_E015高中全科试卷_数学试题_选修1_02.同步练习_1.同步练习

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新教材精创1.4.1用空间向量研究直线、平面的位置关系(1)A基础练(解析版)_E015高中全科试卷_数学试题_选修1_02.同步练习_1.同步练习
新教材精创1.4.1用空间向量研究直线、平面的位置关系(1)A基础练(解析版)_E015高中全科试卷_数学试题_选修1_02.同步练习_1.同步练习
新教材精创1.4.1用空间向量研究直线、平面的位置关系(1)A基础练(解析版)_E015高中全科试卷_数学试题_选修1_02.同步练习_1.同步练习
新教材精创1.4.1用空间向量研究直线、平面的位置关系(1)A基础练(解析版)_E015高中全科试卷_数学试题_选修1_02.同步练习_1.同步练习

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1.4.1 用空间向量研究直线、平面的位置关系(1)-A基础练 一、选择题 1.已知向量a=(2,4,5),b=(3,x,y)分别是直线l,l 的方向向量,若l∥l,则( ) 1 2 1 2 15 15 A.x=6,y=15 B.x=3,y= C.x=3,y=15 D.x=6,y= 2 2 【答案】D 3 x y 15 【解析】由题意,有a∥b,则 = = ,得x=6,y= . 2 4 5 2 2.设a=(3,-2,-1)是直线l的方向向量,n=(1,2,-1)是平面α的法向量,则( ) A.l⊥α B.l∥α C.l∥α或l α D.l⊥α或l α 【答案】C ⊂ ⊂ 【解析】∵a·n=0,∴a⊥n,可知l∥α或l α. 3.设α,β是不重合的两个平面,α,β的法⊂向量分别为n,n,l和m是不重合的两条直线,l,m的方向向量分别为 1 2 e,e,那么α∥β的一个充分条件是( ) 1 2 A.l α,m β,且e⊥n,e⊥n B.l α,m β,且e∥e 1 1 2 2 1 2 C.e⊂∥n,⊂e∥n,且e∥e D.e⊂⊥n⊂,e⊥n,且e∥e 1 1 2 2 1 2 1 1 2 2 1 2 【答案】C 【解析】对于C,有n∥n,则α∥β.故选C. 1 2 √2a 4.在正方体ABCD-A BC D 中,棱长为a,M,N分别为AB和AC上的点,AM=AN= ,则MN与平面BBC C 1 1 1 1 1 1 1 1 3 的位置关系是( ) A.相交 B.平行 C.垂直 D.不能确定 【答案】B 【解析】建立如图所示的空间直角坐标系,由图可知平面BBC C的法向量n=(0,1,0). 1 1 √2a ( 2a a) (2a 2a ) ( a 2a) ∵AM=AN= ,∴M a, , ,N , ,a ,∴⃗MN= - ,0, .∵⃗MN·n=0,∴MN∥ 平 面 1 3 3 3 3 3 3 3 BBC C. 1 15.(多选题)若直线l的方向向量为m,平面α的法向量为n,则不可能使l∥α的是( ) A.m=(1,0,0),n=(-2,0,0) B.m=(1,3,5),n=(1,0,1) C.m=(0,2,1),n=(-1,0,-1) D.m=(1,-1,3),n=(0,3,1) 【答案】ABC 【解析】若 l∥α,则需 m⊥n,即 m·n=0,根据选择项验证可知:A 中,m·n=-2;B 中,m·n=6;C 中,m·n=-1;D 中,m·n=0,故选A,B,C. 6.(多选题)(2020全国高二课时练习)在如图所示的坐标系中, 为正方体,则下列结 论中正确的是( ) A.直线 的一个方向向量为(0,0,1); B.直线 的一个方向向量为(0,1,1); C.平面 的一个法向量为(0,1,0); D.平面 的一个法向量为(1,1,1). 【答案】ABC 【解析】 DD ∥AA, =(0,0,1),故A正确;BC ∥AD, =(0,1,1), 故B正确;直线AD⊥平面 1 1 1 1 ABBA, =(0,1,0). 故C正确;点C 的坐标为(1,1,1), 与平面BCD不垂直,故D错. 1 1 1 1 二、填空题 7.已知直线 l∥平面 ABC,且 l 的一个方向向量为 a=(2,m,1),A(0,0,1),B(1,0,0),C(0,1,0),则实数 m 的值是 . 【答案】-3 【解析】∵直线l∥平面ABC,∴存在实数x,y,使a=x⃗AB+y⃗AC,⃗AB=(1,0,-1),⃗AC=(0,1,-1), { 2=x, ∴(2,m,1)=x(1,0,-1)+y(0,1,-1)=(x,y,-x-y),∴ m= y, ∴m=-3. 1=-x- y, ( 1) 8.平面α的法向量u=(x,1,-2),平面β的法向量v= -1,y, ,已知α∥β,则x+y= . 215 【答案】 4 x = 1 = -2 { x=4, 15 【解析】因为α∥β,所以u∥v.则-1 y 1 ,即 1 故x+y= . y=- , 4 2 4 9.(2020广西壮族自治区高二月考)在平面 中, , , ,若 ,且 为平面 的法向量,则 _______, . 【答案】1;0 【解析】 , ,与平面ABC垂直的向量应与上面的向量的数量积为零,向 量 =(﹣1,y,z),且 为平面ABC的法向量,则 ⊥ 且 ⊥ ,即 • =0,且 • =0, 即﹣1+y+0=0且1﹣y﹣2z=0,即 . 10.已知△ABC的三个顶点坐标分别为A(0,0,2),B(4,2,0),C(2,4,0),平面ABC的单位法向量为 .. 15 【答案】 4 【 解 析 】 ⃗AB=(4,2,-2),⃗AC=(2,4,-2), 设 n=(x,y,z) 是 平 面 ABC 的 单 位 法 向 量 , 则 有 {|n|2=1, {x2+ y2+z2=1, 取 z>0, 得 x=y= 1 ,z= 3 . 故 平 面 ABC 的 单 位 法 向 量 为 n= n·⃗AB=0,⇒ 2x+ y-z=0, √11 √11 n·⃗AC=0 x+2y-z=0. (√11 √11 3√11). , , 11 11 11 三、解答题 11.在棱长为1的正方体ABCD-A BC D 中,求平面ACD 的一个法向量n. 1 1 1 1 1【答案】见解析 【解析】如图,建立空间直角坐标系,则A(1,0,0),C(0,1,0),D(0,0,1). 1 设平面ACD 的法向量n=(x,y,z). 1 ∵ =(-1,1,0), =(-1,0,1),又∵n为平面ACD 的一个法向量, ⃗AC ⃗AD 1 1 ∴{n·⃗AC=0, ∴{(x,y,z)·(-1,1,0)=0, 化简,得{x= y, n·⃗AD =0, (x,y,z)·(-1,0,1)=0, x=z. 1 令x=1,得y=z=1. ∴平面ACD 的一个法向量n=(1,1,1). 1 12.(2020银川一中高二期中)在三棱锥O-ABC中,OA=OB=1,OC=2,OA,OB,OC两两垂直,试找出一点D,使 BD∥AC,DC∥AB. 【答案】见解析 【解析】建立如图所示的空间直角坐标系, 则A(1,0,0),B(0,1,0),C(0,0,2),设所求点D(x,y,z). 由BD∥AC,DC∥AB ⃗BD∥⃗AC,⃗DC∥⃗AB, {(x,y-1,z) ⇒ =k (-1,0,2), {x=-1, 因此 1 ⇒ y=1, (-x,- y,2-z)=k (-1,1,0), 2 z=2. 即点D的坐标为(-1,1,2).
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  1. CONNECT:[ UseTime:0.000407s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000792s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000331s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000269s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000467s ]
  6. SELECT * FROM `set` [ RunTime:0.000191s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000595s ]
  8. SELECT * FROM `wendang` WHERE `id` = 238371 LIMIT 1 [ RunTime:0.000616s ]
  9. UPDATE `wendang` SET `liulancishu` = 5 WHERE `id` = 238371 [ RunTime:0.001181s ]
  10. UPDATE `wendang` SET `lasttime` = 1772298675 WHERE `id` = 238371 [ RunTime:0.000556s ]
  11. SELECT * FROM `wendang` WHERE `id` < 238371 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000496s ]
  12. SELECT * FROM `wendang` WHERE `id` > 238371 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000464s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 238371 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001757s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 238371 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001320s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 238371 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001812s ]
0.080063s