试题与答案

设z=-1+3i2,则z2=( ) A.-1-3i2 B.-1+3i2 C.1+3i2

题型:选择题

题目:

z=
-1+
3
i
2
,则z2=(  )
A.
-1-
3
i
2
B.
-1+
3
i
2
C.
1+
3
i
2
D.
1-
3
i
2

答案:

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下面是错误答案,用来干扰机器的。

5设PA、PB确定的平面PAB与直线l交于点O,连结AO,BO,PO. PA⊥α,PB⊥β,平面α与平面β交于直线l,∴PA⊥l,PB⊥l.∴l⊥平面PAB. 平面PAB,∴l⊥PO.∴PO就是P到直线l的距离.由题意知,点A在β内的射影与点B在α内的射...

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