7.Let [img=199x61]1802dde9690822d.png[/img] .Does [img=62x33]1802dde9710faf4.png[/img]exists ? A: (A) Yes, since [img=196x27]1802dde97ac0dbf.png[/img] for any [img=46x20]1802dde9831551a.png[/img], by pinching theorem, [img=62x33]1802dde98b6a13d.png[/img] exists. B: (B) Yes, since [img=180x27]1802dde995267d8.png[/img] for any [img=46x20]1802dde9831551a.png[/img], by pinching theorem, [img=62x33]1802dde98b6a13d.png[/img] exists. C: (C) No, since there exists some [img=46x20]1802dde9831551a.png[/img] such that [img=196x27]1802dde9b73b240.png[/img] and some [img=46x20]1802dde9831551a.png[/img] such that [img=196x27]1802dde97ac0dbf.png[/img], we can't apply pinching theorem. D: (D) None of above explanation is correct.

2022-06-11

7.Let [img=199x61]1802dde9690822d.png[/img] .Does [img=62x33]1802dde9710faf4.png[/img]exists ? A: (A) Yes, since [img=196x27]1802dde97ac0dbf.png[/img] for any [img=46x20]1802dde9831551a.png[/img], by pinching theorem, [img=62x33]1802dde98b6a13d.png[/img] exists. B: (B) Yes, since [img=180x27]1802dde995267d8.png[/img] for any [img=46x20]1802dde9831551a.png[/img], by pinching theorem, [img=62x33]1802dde98b6a13d.png[/img] exists. C: (C) No, since there exists some [img=46x20]1802dde9831551a.png[/img] such that [img=196x27]1802dde9b73b240.png[/img] and some [img=46x20]1802dde9831551a.png[/img] such that [img=196x27]1802dde97ac0dbf.png[/img], we can't apply pinching theorem. D: (D) None of above explanation is correct.

7.Let [img=199x61]1802dde9690822d.png[/img] .Does [img=62x33]1802dde9710faf4.png[/img]exists ?
A: (A) Yes, since [img=196x27]1802dde97ac0dbf.png[/img] for any [img=46x20]1802dde9831551a.png[/img], by pinching theorem, [img=62x33]1802dde98b6a13d.png[/img] exists.
B: (B) Yes, since [img=180x27]1802dde995267d8.png[/img] for any [img=46x20]1802dde9831551a.png[/img], by pinching theorem, [img=62x33]1802dde98b6a13d.png[/img] exists.
C: (C) No, since there exists some [img=46x20]1802dde9831551a.png[/img] such that [img=196x27]1802dde9b73b240.png[/img] and some [img=46x20]1802dde9831551a.png[/img] such that [img=196x27]1802dde97ac0dbf.png[/img], we can't apply pinching theorem.
D: (D) None of above explanation is correct.

答案：

D

举一反三

内容

0
下列4个集合中是空集的是（） A: ｛x|[img=18x22]1803d0240bcad39.png[/img]+1=0｝ B: ｛x|[img=18x22]1803d0240bcad39.png[/img]-x｝ C: ｛x|[img=18x22]1803d0240bcad39.png[/img]=0｝ D: ｛x|[img=18x22]1803d0240bcad39.png[/img]-1=0｝
1
下列等值式中正确的是( )。未知类型：{'options': ['( [img=8x14]17e4385a99bb660.jpg[/img]x)(P(x)→B) ≡ ([img=8x14]17e4385a99bb660.jpg[/img]x)P(x)→B', ' ( [img=8x14]17e4385aa223929.jpg[/img]x)(B→Q(x)) ≡B→([img=8x14]17e4385aa223929.jpg[/img]x)Q(x)', ' ( [img=8x14]17e4385aa223929.jpg[/img]x)(P(x)→B) ≡ ([img=8x14]17e4385aa223929.jpg[/img]x)P(x)→B', ' ( [img=8x14]17e4385aa223929.jpg[/img]x)(B→Q(x)) ≡B→ ([img=8x14]17e4385a99bb660.jpg[/img]x)Q(x)'], 'type': 102}
2
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]
3
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]
4
下列公式中（）不是命题。 A: ([img=10x19]180361811d22e4e.png[/img]x)P(x) B: ([img=10x19]18036181259b0de.png[/img]x)P(x) C: ([img=10x19]180361811d22e4e.png[/img]x)(P(x)[img=12x16]18036181351b766.png[/img]p(y)) D: ([img=10x19]18036181259b0de.png[/img]x)([img=10x19]18036181259b0de.png[/img]y)(P(x)[img=18x11]180361814f231a2.png[/img]p(y))