• 2022-07-22 问题

    设n为奇数,那么11n+C1n?11n-1+C2n?11n-2+…+Cn-1n?11-1除以13的余数是(  ) A: -3 B: 2 C: 10 D: 11

    设n为奇数,那么11n+C1n?11n-1+C2n?11n-2+…+Cn-1n?11-1除以13的余数是(  ) A: -3 B: 2 C: 10 D: 11

  • 2022-07-23 问题

    设n为奇数,那么11n+C1n•11n-1+C2n•11n-2+…+Cn-1n•11-1除以13的余数是(  )

    设n为奇数,那么11n+C1n•11n-1+C2n•11n-2+…+Cn-1n•11-1除以13的余数是(  )

  • 2022-07-22 问题

    设n为奇数,那么11n+C1n•11n-1+C2n•11n-2+…+Cn-1n•11-1除以13的余数是(  )

    设n为奇数,那么11n+C1n•11n-1+C2n•11n-2+…+Cn-1n•11-1除以13的余数是(  )

  • 2022-06-17 问题

    设X~N(1, 2), Y~N(-1, 3),且X与Y相互独立,则2X-Y~( ) A: N(3, 8) B: N(3, 5) C: N(3, 11) D: N(3,25)

    设X~N(1, 2), Y~N(-1, 3),且X与Y相互独立,则2X-Y~( ) A: N(3, 8) B: N(3, 5) C: N(3, 11) D: N(3,25)

  • 2022-06-12 问题

    图所示机构的自由度是( )。[img=225x225]18034e49029b42b.jpg[/img] A: n=7, PL=10, Ph=0, F=1 B: n=9, PL=12, Ph=2, F=1 C: n=8, PL=11, Ph=1, F=1 D: n=8, PL=11, Ph=0, F=2

    图所示机构的自由度是( )。[img=225x225]18034e49029b42b.jpg[/img] A: n=7, PL=10, Ph=0, F=1 B: n=9, PL=12, Ph=2, F=1 C: n=8, PL=11, Ph=1, F=1 D: n=8, PL=11, Ph=0, F=2

  • 2022-06-07 问题

    计算N阶行列式:11...1(-n)11...(-n)1............1(-n)..11(-n)1...11

    计算N阶行列式:11...1(-n)11...(-n)1............1(-n)..11(-n)1...11

  • 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().

  • 2022-06-03 问题

    已知M(-1,5),N ( 7,y),且|MN| = 10,则 y的值为: A: -1或11 B: -1或-11 C: 1或11 D: 1或-11

    已知M(-1,5),N ( 7,y),且|MN| = 10,则 y的值为: A: -1或11 B: -1或-11 C: 1或11 D: 1或-11

  • 2022-06-30 问题

    请问如下算法运行完之后n,n1,n2分别是多少? var n1=10, n2=20; n = n1++; n = ++n1; n = n2--; n = --n2; A: n=18, n1=12, n2=18 B: n=11, n1=11, n2=19 C: n=12, n1=12, n2=18 D: n=19, n1=11, n2=19

    请问如下算法运行完之后n,n1,n2分别是多少? var n1=10, n2=20; n = n1++; n = ++n1; n = n2--; n = --n2; A: n=18, n1=12, n2=18 B: n=11, n1=11, n2=19 C: n=12, n1=12, n2=18 D: n=19, n1=11, n2=19

  • 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: \( {n^2}(n - 1) \)

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