已知两个不同的平面
和两个不重合的直线
,有下列四个命题:
①若
,
,则
;
②若
,
,则
;
③若
,
,
,则
;
④若
,
,则
.
其中正确命题的个数是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ffdbc2dd999c9e421bdc1e516d99206.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55755d771e6fc75821737cb5885131f6.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78bfbb8457efdf6782623e2e6ba4ecc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc457ba23645bb1fbaa297c5e565f978.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9768d65f13b98d024b3277e3ce4c303.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc457ba23645bb1fbaa297c5e565f978.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf8c87a51dbea25bf26d17f66359b66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7182d8fa93a371b576d589a36995268b.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc457ba23645bb1fbaa297c5e565f978.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78bfbb8457efdf6782623e2e6ba4ecc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dc8748ded577ed1001629e6e6f4a350.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb083c827a7fffbff90916dea20570f.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d03594adb12543bbb27edd66f901ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d23787995160914230ac9fb5de9a89d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78bfbb8457efdf6782623e2e6ba4ecc7.png)
其中正确命题的个数是
A.3 | B.2 | C.1 | D.0 |
更新时间:2017-11-26 06:51:14
|
相似题推荐
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【推荐1】
表示两个不同的平面,
表示既不在
内也不在
内的直线,存在以下三种情况:
①
;②
;③
.
若以其中两个为条件,另一个为结论构成命题,则其中正确命题的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e380108ba2cf04e68a5a9393d2b921c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d953a8497a2d9de6d02f14021d6fdab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5986f2991d45fbf3578f08f27d9fd7e.png)
若以其中两个为条件,另一个为结论构成命题,则其中正确命题的个数为( )
A.0 | B.1 | C.2 | D.3 |
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名校
【推荐2】下列命题:
①若m
α,则m与α内的任何直线平行;
②若α⊥β,b
α,m
β,且b⊥m,则b⊥β;
③若m
α,n
α,且m
β,n
β,则α
β;
④若m
α,n
α,且a⊥m,a⊥n,则a⊥α;
⑤若l1∩l2=P,l2∩l3=Q,l3∩l1=S(P、Q、S是不同的三点),则l1,l2,l3共面;
其中真命题的个数是( )
①若m
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
②若α⊥β,b
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828926e570a414e9dbc04a7bbcb65283.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828926e570a414e9dbc04a7bbcb65283.png)
③若m
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828926e570a414e9dbc04a7bbcb65283.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828926e570a414e9dbc04a7bbcb65283.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
④若m
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828926e570a414e9dbc04a7bbcb65283.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828926e570a414e9dbc04a7bbcb65283.png)
⑤若l1∩l2=P,l2∩l3=Q,l3∩l1=S(P、Q、S是不同的三点),则l1,l2,l3共面;
其中真命题的个数是( )
A.0 | B.1 | C.2 | D.3 |
您最近一年使用:0次
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(0.65)
【推荐1】已知m,n 是两条不同直线,α,β 是两个不同平面,则
A.若m⊥α,α⊥β,则m∥β`; |
B.若m∥α,n⊥α,则m⊥n; |
C.若 m![]() ![]() |
D.若 m∥α,n∥α,则m∥n. |
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适中
(0.65)
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【推荐2】已知
代表不同的平面,
代表不同的直线,则下列说法中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44434b647ec546fe787e2164e0be6cd2.png)
A.若![]() ![]() |
B.若![]() ![]() |
C.若![]() ![]() |
D.若![]() ![]() |
您最近一年使用:0次