A.①② | B.①③ | C.③④ | D.①③④ |
PA |
PB |
a |
b |
c |
x2 |
25 |
y2 |
9 |
x2 |
35 |
A.①③④ | B.①②③ | C.①②④ | D.②③④ |
A.“若xy=0,则x=0且y=0”的逆否命题 |
B.“若ac2>bc2则a>b”的逆命题 |
C.若“m>2,则不等式x2-2x+m>0的解集为R” |
D.“正方形是菱形”的否命题 |
a1(1-qn) |
1-q |
a |
cosA |
b |
cosB |
c |
cosC |
x2+4 |
1 | ||
|
A.(0,1) | B.(-∞,0)∪(1,+∞) | C.[0,1] | D.(-∞,0)∪[1,+∞) |
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