• 2022-05-29 问题

    设`\n`阶方阵`\A`满足`\|A| = 2`,则`\|A^TA| = ,|A^{ - 1}| = ,| A^ ** | = ,| (A^ ** )^ ** | = ,|(A^ ** )^{ - 1} + A| = ,| A^{ - 1}(A^ ** + A^{ - 1})A| = `分别等于( ) A: \[4,\frac{1}{2},{2^{n - 1}},{2^{{{(n - 1)}^2}}},2{(\frac{3}{2})^n},\frac{{{3^n}}}{2}\] B: \[2,\frac{1}{2},{2^{n - 1}},{2^{{{(n + 1)}^2}}},2{(\frac{3}{2})^n},\frac{{{3^n}}}{2}\] C: \[4,\frac{1}{2},{2^{n + 1}},{2^{{{(n - 1)}^2}}},2{(\frac{3}{2})^{n - 1}},\frac{{{3^n}}}{2}\] D: \[2,\frac{1}{2},{2^{n - 1}},{2^{{{(n - 1)}^2}}},2{(\frac{3}{2})^{n - 1}},\frac{{{3^n}}}{2}\]

    设`\n`阶方阵`\A`满足`\|A| = 2`,则`\|A^TA| = ,|A^{ - 1}| = ,| A^ ** | = ,| (A^ ** )^ ** | = ,|(A^ ** )^{ - 1} + A| = ,| A^{ - 1}(A^ ** + A^{ - 1})A| = `分别等于( ) A: \[4,\frac{1}{2},{2^{n - 1}},{2^{{{(n - 1)}^2}}},2{(\frac{3}{2})^n},\frac{{{3^n}}}{2}\] B: \[2,\frac{1}{2},{2^{n - 1}},{2^{{{(n + 1)}^2}}},2{(\frac{3}{2})^n},\frac{{{3^n}}}{2}\] C: \[4,\frac{1}{2},{2^{n + 1}},{2^{{{(n - 1)}^2}}},2{(\frac{3}{2})^{n - 1}},\frac{{{3^n}}}{2}\] D: \[2,\frac{1}{2},{2^{n - 1}},{2^{{{(n - 1)}^2}}},2{(\frac{3}{2})^{n - 1}},\frac{{{3^n}}}{2}\]

  • 2021-04-14 问题

    下列关于时间价值系数的关系式,表达正确的有()()A.(F/A,i,n)=()(P/A,i,n)×(F/P,i,n)()B.(F/P,i,n)=(F/P,i,n1)×(F/P,i,n2),其中n1+n2=n()C.(P/F,i,n)=(P/F,i,n1)+(P/F,i,n2),其中n1+n2=n()D.(P/A,i,n)=(P/F,i,n)×(A/F,i,n)()E.()1/(F/A,i,n)=(F/A,i,1/n)A.()A.(F/A,i,n)=()(P/A,i,n)×(F/P,i,n)()B.()B.(F/P,i,n)=(F/P,i,n1)×(F/P,i,n2),其中n1+n2=n()C.()C.(P/F,i,n)=(P/F,i,n1)+(P/F,i,n2),其中n1+n2=n()D.()D.(P/A,i,n)=(P/F,i,n)×(A/F,i,n)()E.()E.()1/(F/A,i,n)=(F/A,i,1/n)

    下列关于时间价值系数的关系式,表达正确的有()()A.(F/A,i,n)=()(P/A,i,n)×(F/P,i,n)()B.(F/P,i,n)=(F/P,i,n1)×(F/P,i,n2),其中n1+n2=n()C.(P/F,i,n)=(P/F,i,n1)+(P/F,i,n2),其中n1+n2=n()D.(P/A,i,n)=(P/F,i,n)×(A/F,i,n)()E.()1/(F/A,i,n)=(F/A,i,1/n)A.()A.(F/A,i,n)=()(P/A,i,n)×(F/P,i,n)()B.()B.(F/P,i,n)=(F/P,i,n1)×(F/P,i,n2),其中n1+n2=n()C.()C.(P/F,i,n)=(P/F,i,n1)+(P/F,i,n2),其中n1+n2=n()D.()D.(P/A,i,n)=(P/F,i,n)×(A/F,i,n)()E.()E.()1/(F/A,i,n)=(F/A,i,1/n)

  • 2022-06-07 问题

    排列\( n(n - 1)(n - 2) \cdots 3 \cdot 2 \cdot 1 \)的逆序数是( ) A: \( {1 \over 2}n(n - 1) \) B: \( n(n - 1) \) C: \( n \) D: \( {n^2}(n - 1) \)

    排列\( n(n - 1)(n - 2) \cdots 3 \cdot 2 \cdot 1 \)的逆序数是( ) A: \( {1 \over 2}n(n - 1) \) B: \( n(n - 1) \) C: \( n \) D: \( {n^2}(n - 1) \)

  • 2022-07-01 问题

    1.下列数列中,收敛但极限不为$1$的是 A: ${{(2+\frac{1}{n})}^{\frac{1}{n}}}$ B: ${{n}^{\frac{1}{n}}}$ C: $\frac{1}{{{n}^{2}}+1}+\frac{2}{{{n}^{2}}+2}+\cdots +\frac{n}{{{n}^{2}}+n}$ D: $\frac{{{(n!)}^{2}}}{{{n}^{n}}}$

    1.下列数列中,收敛但极限不为$1$的是 A: ${{(2+\frac{1}{n})}^{\frac{1}{n}}}$ B: ${{n}^{\frac{1}{n}}}$ C: $\frac{1}{{{n}^{2}}+1}+\frac{2}{{{n}^{2}}+2}+\cdots +\frac{n}{{{n}^{2}}+n}$ D: $\frac{{{(n!)}^{2}}}{{{n}^{n}}}$

  • 2021-04-14 问题

    【单选题】已知数列{a n }中,a 1 =1,当n≥2时,a n =2a n - 1 +1,依次计算a 2 ,a 3 ,a 4 后,猜想a n 的一个表达式是()(5.0分) A. n 2 ﹣1 B. (n﹣1) 2 +1 C. 2 n ﹣1 D. 2 n ﹣ 1 +1

    【单选题】已知数列{a n }中,a 1 =1,当n≥2时,a n =2a n - 1 +1,依次计算a 2 ,a 3 ,a 4 后,猜想a n 的一个表达式是()(5.0分) A. n 2 ﹣1 B. (n﹣1) 2 +1 C. 2 n ﹣1 D. 2 n ﹣ 1 +1

  • 2022-05-28 问题

    在下列各项中,运算级别最低的为( )。 A: m=2,n=1 m=1,n=2 B: m=2,n=1 m=4,n=1 C: m=1,n=2 m=1,n=4 D: m=1,n=2 m=2,n=4

    在下列各项中,运算级别最低的为( )。 A: m=2,n=1 m=1,n=2 B: m=2,n=1 m=4,n=1 C: m=1,n=2 m=1,n=4 D: m=1,n=2 m=2,n=4

  • 2021-04-14 问题

    T(n) = 2T(n/2) +n^2,T(1)=1,则 T(n) =()

    T(n) = 2T(n/2) +n^2,T(1)=1,则 T(n) =()

  • 2021-04-14 问题

    已知()y()=()ln()x(),则()y()(()n())()=()。A.()(()−()1())()n()n()!()x()−()n()"()role="presentation">()(()−()1())()n()n()!()x()−()n();()B.()(()−()1())()n()(()n()−()1())()!()x()−()2()n()"()role="presentation">()(()−()1())()n()(()n()−()1())()!()x()−()2()n();()C.()(()−()1())()n()−()1()(()n()−()1())()!()x()n()"()role="presentation">()(()−()1())()n()−()1()(()n()−()1())()!()x()-n();()D.()(()−()1())()n()−()1()n()!()x()−()n()+()1()"()role="presentation">()(()−()1())()n()−()1()n()!()x()−()n()+()1().

    已知()y()=()ln()x(),则()y()(()n())()=()。A.()(()−()1())()n()n()!()x()−()n()"()role="presentation">()(()−()1())()n()n()!()x()−()n();()B.()(()−()1())()n()(()n()−()1())()!()x()−()2()n()"()role="presentation">()(()−()1())()n()(()n()−()1())()!()x()−()2()n();()C.()(()−()1())()n()−()1()(()n()−()1())()!()x()n()"()role="presentation">()(()−()1())()n()−()1()(()n()−()1())()!()x()-n();()D.()(()−()1())()n()−()1()n()!()x()−()n()+()1()"()role="presentation">()(()−()1())()n()−()1()n()!()x()−()n()+()1().

  • 2022-06-19 问题

    在由N个构件组成的机构中,有_____个相对瞬心,有____个绝对瞬心。 A: N(N−1)/4,N(N−1)/4 B: (N−1)(N−2)/2,N−1; C: N,N(N−3)/2 D: N(N−3)/2,N

    在由N个构件组成的机构中,有_____个相对瞬心,有____个绝对瞬心。 A: N(N−1)/4,N(N−1)/4 B: (N−1)(N−2)/2,N−1; C: N,N(N−3)/2 D: N(N−3)/2,N

  • 2022-06-11 问题

    ​在由N个构件组成的机构中,有_____个相对瞬心,有____个绝对瞬心。​ A: (N−1)(N−2)/2,N −1; B: N(N−3)/2 ,N C: N(N−1)/4 ,N(N−1)/4 D: N ,N(N−3)/2

    ​在由N个构件组成的机构中,有_____个相对瞬心,有____个绝对瞬心。​ A: (N−1)(N−2)/2,N −1; B: N(N−3)/2 ,N C: N(N−1)/4 ,N(N−1)/4 D: N ,N(N−3)/2

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