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如图,在复平面内,复数z1,z2对应的向量分别是,,则复数对应的点位于( ) A...
如图,在复平面内,复数z
1,z
2对应的向量分别是
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212973654/SYS201310251237212129736001_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212973654/SYS201310251237212129736001_ST/1.png)
,则复数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212973654/SYS201310251237212129736001_ST/2.png)
对应的点位于( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212973654/SYS201310251237212129736001_ST/images3.png)
A.第一象限
B.第二象限
C.第三象限
D.第四象限
考点分析:
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,B={x|x>a},若A⊆B,则实数a的取值范围是( )
A.
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B.
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C.a≤1
D.a<1
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212971676/SYS201310251237212129716021_ST/images0.png)
如图,在正三棱柱ABC-A
1B
1C
1中,AA
1=AB,D是AC的中点.
(1)求证:B
1C∥平面A
1BD;
(2)求证:平面A
1BD⊥平面ACC
1A
1;
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1B-D的余弦值.
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如图,在四棱锥P-ABCD中,底面ABCD为直角梯形,AD∥BC,∠ADC=90°,平面PAD⊥底面ABCD,Q为AD的中点,M是棱PC上的点,PA=PD=2,BC=
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.
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