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【单选题】
若$A,B$为$R$中的非空有界集，记${M_1} = \inf \,(A \cup B),{M_2} = \min \{ \inf A,\inf B\},{N_1} = \sup \,(A \cup B), {N_2} = \max \{ \sup A,\sup B\} $,则 ( ).
A.
$M_1 < M_2, N_1 > N_2 $
B.
$M_1 = M_2, N_1 > N_2 $
C.
$M_1 < M_2, N_1 = N_2 $
D.
$M_1 = M_2, N_1 = N_2 $
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题目标签：界集
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】若$A,B$为$R$中的非空有界集，记${M_1} = \inf \,(A \cup B),{M_2} = \min \{ \inf A,\inf B\},{N_1} = \sup \,(A \cup B), {N_2} = \max \{ \sup A,\sup B\} $,则 ( ).
A.
$M_1 < M_2, N_1 > N_2 $
B.
$M_1 = M_2, N_1 > N_2 $
C.
$M_1 < M_2, N_1 = N_2 $
D.
$M_1 = M_2, N_1 = N_2 $
【单选题】font siez="3"> 5.若$A,B$为$R$中的非空有界集，记${M_1} = \inf \,(A \cup B),{M_2} = \min \{ \inf A,\inf B\},{N_1} = \sup \,(A \cup B), {N_2} = \max \{ \sup A,\sup B\} $,则 ( ).
A.
$M_1 < M_2, N_1 > N_2 $
B.
$M_1 = M_2, N_1 > N_2 $
C.
$M_1 < M_2, N_1 = N_2 $
D.
$M_1 = M_2, N_1 = N_2 $
【单选题】设$A,B$为$R^+$中的非空有界集, 定义数集$P = \{ \left. x \right|x = a + b,a \in A,b \in B\} ,Q = \{ \left. x \right|x = a - b,a \in A,b \in B\} $, 则下列四个等式$ \qquad \sup P = \sup A + \sup B;\qquad \inf P = \inf A + \i...
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