• 2022-05-29 问题

    对下列各组函数f(n)和g(n),确定f(n)=O(g(n))或f(n)=Ω(g(n))或f(n)=θ(g(n)),并简要说明理由。(1)f(n)=2n;g(n)=n!(2)f(n)=√n;g(n)=logn2(3)f(n)=100;g(n)=log100(4)f(n)=n3;g(n)=3n(5)f(n)=3n;g(n)=2n

    对下列各组函数f(n)和g(n),确定f(n)=O(g(n))或f(n)=Ω(g(n))或f(n)=θ(g(n)),并简要说明理由。(1)f(n)=2n;g(n)=n!(2)f(n)=√n;g(n)=logn2(3)f(n)=100;g(n)=log100(4)f(n)=n3;g(n)=3n(5)f(n)=3n;g(n)=2n

  • 2021-04-14 问题

    对下列各组函数f (n) 和g (n),确定f (n) = O (g (n)) 或f (n) =Ω(g (n))或f(n) =θ(g(n)),并简要说明理由。 (1) f(n)=2n; g(n)=n! (2) f(n)=; g (n)=log n2 (3) f(n)=100; g(n)=log100 (4) f(n)=n3; g(n)= 3n (5) f(n)=3n; g(n)=2n/ananas/latex/p/3480

    对下列各组函数f (n) 和g (n),确定f (n) = O (g (n)) 或f (n) =Ω(g (n))或f(n) =θ(g(n)),并简要说明理由。 (1) f(n)=2n; g(n)=n! (2) f(n)=; g (n)=log n2 (3) f(n)=100; g(n)=log100 (4) f(n)=n3; g(n)= 3n (5) f(n)=3n; g(n)=2n/ananas/latex/p/3480

  • 2022-07-23 问题

    设G为群,则G中的幂运算满足()。 A: ∀a∈G,(a-1)-1=a B: ∀a,b∈G,(ab)-1=b-1a- C: ∀a∈G,anam=an+m,n,m∈Z D: 若G为交换群,(ab)n=anbn

    设G为群,则G中的幂运算满足()。 A: ∀a∈G,(a-1)-1=a B: ∀a,b∈G,(ab)-1=b-1a- C: ∀a∈G,anam=an+m,n,m∈Z D: 若G为交换群,(ab)n=anbn

  • 2022-06-28 问题

    实际金属结晶时,通过控制形核速率(N)和长大速率(G)的比值来控制晶粒大小,在下列哪种情况下获得粗大晶粒( )。 A: N/G≫1 B: N/G≪1时 C: N/G=1时 D: N/G≈1时

    实际金属结晶时,通过控制形核速率(N)和长大速率(G)的比值来控制晶粒大小,在下列哪种情况下获得粗大晶粒( )。 A: N/G≫1 B: N/G≪1时 C: N/G=1时 D: N/G≈1时

  • 2021-04-14 问题

    【单选题】f(N)与g(N)同阶记为f(N)=θ(g(N)),当且仅当 且 。 A. f(N)=O(g(N)); g(N)= Ω (f(N)); B. f(N)=g(N); g(N)=g(N); C. f(N)= Ω (g(N)); f(N)= O (g(N)); D. f(N)= w (g(N)); f(N)= o (g(N));

    【单选题】f(N)与g(N)同阶记为f(N)=θ(g(N)),当且仅当 且 。 A. f(N)=O(g(N)); g(N)= Ω (f(N)); B. f(N)=g(N); g(N)=g(N); C. f(N)= Ω (g(N)); f(N)= O (g(N)); D. f(N)= w (g(N)); f(N)= o (g(N));

  • 2021-04-14 问题

    在298.15K时,ΔbHϴm(F-F)=158kJ·mol–1,ΔbHϴm(N≡N)=946kJ·mol–1,ΔbHϴm(F-N)=272kJ·mol–1,反应3F2(g)+N2(g) = 2NF3(g) 的ΔrHϴm等于

    在298.15K时,ΔbHϴm(F-F)=158kJ·mol–1,ΔbHϴm(N≡N)=946kJ·mol–1,ΔbHϴm(F-N)=272kJ·mol–1,反应3F2(g)+N2(g) = 2NF3(g) 的ΔrHϴm等于

  • 2022-05-29 问题

    对于函数f(n)=2n;g(n)=3n,确定f(n)=O(g(n))或f(n)=Ω(g(n))或f(n)=θ(g(n)) A: f(n)=O(g(n)) B: f(n)=Ω(g(n)) C: f(n)=θ(g(n))

    对于函数f(n)=2n;g(n)=3n,确定f(n)=O(g(n))或f(n)=Ω(g(n))或f(n)=θ(g(n)) A: f(n)=O(g(n)) B: f(n)=Ω(g(n)) C: f(n)=θ(g(n))

  • 2022-05-29 问题

    下列说法正确的是:Which options may be correct?(there are more than one correct answers) A: 如果函数f(n)是O(g(n)),g(n)是O(h(n)),那么f(n)是O(h(n))【 if f(n) is O(g(n)),g(n) is O(h(n)),then f(n) is O(h(n))】 B: 如果函数f(n)是O(g(n)),g(n)是O(h(n)),那么f(n)+g(n)是O(h(n))【if f(n) is O(g(n)),g(n) is O(h(n)),so f(n)+g(n) is O(h(n))】 C: 如果a>b>1,[img=41x23]180372b4386b7c1.png[/img]是[img=67x25]180372b44103fd1.png[/img],但[img=39x23]180372b449f3875.png[/img]不一定是[img=68x25]180372b453eacb6.png[/img]【if a>b>1,[img=41x23]180372b4386b7c1.png[/img] is [img=67x25]180372b44103fd1.png[/img], [img=39x23]180372b449f3875.png[/img] may not be [img=68x25]180372b453eacb6.png[/img]】 D: 函数f(n)是O(g(n)),当常数a足够大时,一定有函数g(n)是O(af(n))【if f(n)是O(g(n)),When constant a is big enough ,there must be g(n) is O(af(n))】

    下列说法正确的是:Which options may be correct?(there are more than one correct answers) A: 如果函数f(n)是O(g(n)),g(n)是O(h(n)),那么f(n)是O(h(n))【 if f(n) is O(g(n)),g(n) is O(h(n)),then f(n) is O(h(n))】 B: 如果函数f(n)是O(g(n)),g(n)是O(h(n)),那么f(n)+g(n)是O(h(n))【if f(n) is O(g(n)),g(n) is O(h(n)),so f(n)+g(n) is O(h(n))】 C: 如果a>b>1,[img=41x23]180372b4386b7c1.png[/img]是[img=67x25]180372b44103fd1.png[/img],但[img=39x23]180372b449f3875.png[/img]不一定是[img=68x25]180372b453eacb6.png[/img]【if a>b>1,[img=41x23]180372b4386b7c1.png[/img] is [img=67x25]180372b44103fd1.png[/img], [img=39x23]180372b449f3875.png[/img] may not be [img=68x25]180372b453eacb6.png[/img]】 D: 函数f(n)是O(g(n)),当常数a足够大时,一定有函数g(n)是O(af(n))【if f(n)是O(g(n)),When constant a is big enough ,there must be g(n) is O(af(n))】

  • 2022-05-29 问题

    下列说法正确的是:‍Which options may be correct?(there are more than one correct answers)‍ A: 如果函数f(n)是O(g(n)),g(n)是O(h(n)),那么f(n)是O(h(n))【 if f(n) is O(g(n)),g(n) is O(h(n)),then f(n) is O(h(n))】 B: 如果函数f(n)是O(g(n)),g(n)是O(h(n)),那么f(n)+g(n)是O(h(n))【if f(n) is O(g(n)),g(n) is O(h(n)),so f(n)+g(n) is O(h(n))】 C: 如果a>b>1,[img=41x23]1802faed7067085.png[/img]是[img=67x25]1802faed78ce834.png[/img],但[img=39x23]1802faed807a0a4.png[/img]不一定是[img=68x25]1802faed88843cd.png[/img]【if a>b>1,[img=41x23]1802faed7067085.png[/img] is [img=67x25]1802faed78ce834.png[/img], [img=39x23]1802faed807a0a4.png[/img] may not be [img=68x25]1802faed88843cd.png[/img]】 D: 函数f(n)是O(g(n)),当常数a足够大时,一定有函数g(n)是O(af(n))【if f(n)是O(g(n)),When constant a is big enough ,there must be g(n) is O(af(n))】

    下列说法正确的是:‍Which options may be correct?(there are more than one correct answers)‍ A: 如果函数f(n)是O(g(n)),g(n)是O(h(n)),那么f(n)是O(h(n))【 if f(n) is O(g(n)),g(n) is O(h(n)),then f(n) is O(h(n))】 B: 如果函数f(n)是O(g(n)),g(n)是O(h(n)),那么f(n)+g(n)是O(h(n))【if f(n) is O(g(n)),g(n) is O(h(n)),so f(n)+g(n) is O(h(n))】 C: 如果a>b>1,[img=41x23]1802faed7067085.png[/img]是[img=67x25]1802faed78ce834.png[/img],但[img=39x23]1802faed807a0a4.png[/img]不一定是[img=68x25]1802faed88843cd.png[/img]【if a>b>1,[img=41x23]1802faed7067085.png[/img] is [img=67x25]1802faed78ce834.png[/img], [img=39x23]1802faed807a0a4.png[/img] may not be [img=68x25]1802faed88843cd.png[/img]】 D: 函数f(n)是O(g(n)),当常数a足够大时,一定有函数g(n)是O(af(n))【if f(n)是O(g(n)),When constant a is big enough ,there must be g(n) is O(af(n))】

  • 2022-06-07 问题

    下列说法正确的是:Which options may be correct?(there are more than one correct answers) A: 如果函数f(n)是O(g(n)),g(n)是O(h(n)),那么f(n)是O(h(n))【 if f(n) is O(g(n)),g(n) is O(h(n)),then f(n) is O(h(n))】 B: 如果函数f(n)是O(g(n)),g(n)是O(h(n)),那么f(n)+g(n)是O(h(n))【if f(n) is O(g(n)),g(n) is O(h(n)),so f(n)+g(n) is O(h(n))】 C: 如果a>b>1,[img=41x23]18032879c23657e.png[/img]是[img=67x25]18032879cad7aae.png[/img],但[img=39x23]18032879d337b62.png[/img]不一定是[img=68x25]18032879dba84ea.png[/img]【if a>b>1,[img=41x23]18032879c23657e.png[/img] is [img=67x25]18032879cad7aae.png[/img], [img=39x23]18032879d337b62.png[/img] may not be [img=68x25]18032879dba84ea.png[/img]】 D: 函数f(n)是O(g(n)),当常数a足够大时,一定有函数g(n)是O(af(n))【if f(n)是O(g(n)),When constant a is big enough ,there must be g(n) is O(af(n))】

    下列说法正确的是:Which options may be correct?(there are more than one correct answers) A: 如果函数f(n)是O(g(n)),g(n)是O(h(n)),那么f(n)是O(h(n))【 if f(n) is O(g(n)),g(n) is O(h(n)),then f(n) is O(h(n))】 B: 如果函数f(n)是O(g(n)),g(n)是O(h(n)),那么f(n)+g(n)是O(h(n))【if f(n) is O(g(n)),g(n) is O(h(n)),so f(n)+g(n) is O(h(n))】 C: 如果a>b>1,[img=41x23]18032879c23657e.png[/img]是[img=67x25]18032879cad7aae.png[/img],但[img=39x23]18032879d337b62.png[/img]不一定是[img=68x25]18032879dba84ea.png[/img]【if a>b>1,[img=41x23]18032879c23657e.png[/img] is [img=67x25]18032879cad7aae.png[/img], [img=39x23]18032879d337b62.png[/img] may not be [img=68x25]18032879dba84ea.png[/img]】 D: 函数f(n)是O(g(n)),当常数a足够大时,一定有函数g(n)是O(af(n))【if f(n)是O(g(n)),When constant a is big enough ,there must be g(n) is O(af(n))】

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