3 | x |
1 | |||
|
4x-x2 |
1 |
3 |
1 |
2 |
a2-8 |
4 |
C | r6 |
C | s10 |
r |
3 |
s |
4 |
a2-8 |
4 |
a2-8 |
4 |
2 |
3 |
1 |
2 |
a2-8 |
4 |
2 |
3 |
1 |
2 |
a2+8 |
π |
4 |
π |
2 |
π |
6 |
1 |
2 |
1 |
2 |
A.命题“若q则p”与命题“若p则q”互为逆命题 |
B.”am2<bm2”是”a<b”的充要条件 |
C.“矩形的两条对角线相等”的否定为假 |
D.命题:”∅⊆{1,2}或4∉{1,2}为真”(其中∅为空集) |
A.①与 ② | B.③与④ | C.②与④ | D.①与③ |
© 2017-2019 超级试练试题库,All Rights Reserved.