True or False : If [img=52x32]1802ddd740eab2f.png[/img] does not exist and [img=51x32]1802ddd748fbd7e.png[/img] does not exist either, then [img=94x33]1802ddd750d8d30.png[/img] does not exist.
A: True.
B: False.
C: -
D: -
A: True.
B: False.
C: -
D: -
举一反三
- If [img=67x35]1803e23a529c456.png[/img]exists and [img=67x35]1803e23a5bdddbb.png[/img] does not exist，then [img=134x35]1803e23a638f5a2.png[/img] must not exist.
- 3. Let [img=161x53]1802dde8d59661c.png[/img] and [img=180x61]1802dde8df7d956.png[/img].Determine whether [img=62x33]1802dde8e7e5fb9.png[/img] and [img=61x33]1802dde8f088425.png[/img] exist or not. A: (A) [img=62x33]1802dde8f81f6da.png[/img] and [img=61x33]1802dde8ff2f966.png[/img] both exist. B: (B) [img=62x33]1802dde8f81f6da.png[/img] exists but [img=61x33]1802dde8ff2f966.png[/img] does not exist. C: (C) [img=62x33]1802dde8f81f6da.png[/img] does not exist but [img=61x33]1802dde8ff2f966.png[/img] exists. D: (D) [img=62x33]1802dde8f81f6da.png[/img] and [img=61x33]1802dde8ff2f966.png[/img] do not exist.
- 5. Which of the following limits does Not exist? A: [img=70x44]1802ddc9fc66beb.png[/img] B: [img=48x43]1802ddca04d764c.png[/img] C: [img=147x50]1802ddca0f21644.png[/img] D: [img=115x46]1802ddca16e0a22.png[/img]
- Which of the following propositions is false,set A = {x,x is an integer and[img=60x23]1803a1c6eebb7a3.png[/img]} ? ( ) A: [img=113x25]1803a1c6f77ce06.png[/img] B: [img=139x25]1803a1c7001fe79.png[/img] C: [img=51x22]1803a1c70863f61.png[/img] D: {x|x is an integer and |x| 4}[img=33x22]1803a1c711a7c63.png[/img]
- Which of the following propositions is false,set A = {x,x is an integer and [img=60x23]1803a1c503ffa04.png[/img]} ? ( ) A: [img=113x25]1803a1c50cc3162.png[/img] B: [img=139x25]1803a1c514e60ea.png[/img] C: [img=51x22]1803a1c51dd52ef.png[/img] D: {x|x is an integer and |x| <4} [img=33x22]1803a1c525cf1bd.png[/img]