A.两个共轭复数的模相等 | B.z∈R⇔z=
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C.|z1|=|z2|⇔z1=±z2 | D.|z|2=z•
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z |
. |
z |
a2+b2 |
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z |
2 |
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z |
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z |
a |
c |
b |
d |
a |
c2 |
b |
c2 |
A.(-2,2) | B.[-2,2] | C.(-∞,-2)∪(2,+∞) | D.(-∞,-2]∪[2,+∞) |
A.命题“若am2<bm2,则a<b”的逆命题是真命题 |
B.命题“∃x∈R,x2-x>0”的否定是“∀x∈R,x2-x≤0” |
C.命题“p∨q”为真命题,则命题“p”和命题“q”均为真命题 |
D.已知x∈R,则“x>1”是“x>2”的充分不必要条件 |
π |
2 |
A.1 | B.2 | C.3 | D.4 |
A.4 | B.3 | C.2 | D.1 |
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