π |
4 |
π |
2 |
π |
6 |
1 |
2 |
1 |
2 |
3π |
4 |
π |
4 |
π |
4 |
π |
2 |
5π |
6 |
π |
6 |
1 |
2 |
π |
6 |
1 |
2 |
1 |
2 |
1 |
2 |
5 |
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 |
1 |
2 |
. |
x |
. |
y |
A.1个 | B.2个 | C.3个 | D.4个 |
x2 |
16-k |
y2 |
k |
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