A.直角坐标平面内直线的倾斜角的取值范围是[0,π) | ||
B.直角坐标平面内两条直线夹角的取值范围是[0 ,
| ||
C.平面内两个非零向量的夹角的取值范围是[0,π) | ||
D.空间两条直线所成角的取值范围是[0 ,
|
π |
2 |
π |
2 |
a |
b |
c |
a |
b |
a |
c |
b |
c |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
a |
b |
A.①② | B.①②③ | C.②④ | D.②③ |
A.若a>b,则ac2>bc2 | ||||
B.-2<a<3,1<b<2,则-3<a-b<1 | ||||
C.若a>b>0,m>0,则
| ||||
D.若a>b,c>d,则ac>bd |
© 2017-2019 超级试练试题库,All Rights Reserved.