• 2022-06-07 问题

    求不定积分[img=115x46]17da65382f8e1b9.png[/img]; ( ) A: x - (5*log(x + 1))/4 - (3*log(x - 3)) B: (5*log(x + 1))/4 - (3*log(x - 3)) C: x - (5*log(x + 1))/4 - (3*log(x - 3))/4 D: (5*log(x + 1))/4 - (3*log(x - 3))/4

    求不定积分[img=115x46]17da65382f8e1b9.png[/img]; ( ) A: x - (5*log(x + 1))/4 - (3*log(x - 3)) B: (5*log(x + 1))/4 - (3*log(x - 3)) C: x - (5*log(x + 1))/4 - (3*log(x - 3))/4 D: (5*log(x + 1))/4 - (3*log(x - 3))/4

  • 2022-06-01 问题

    If5/<em>x</em>+4/5=1,whatisthevalueof<em>x</em>? A: -25/4 B: -4 C: -5/4 D: -1/5 E: 25

    If5/<em>x</em>+4/5=1,whatisthevalueof<em>x</em>? A: -25/4 B: -4 C: -5/4 D: -1/5 E: 25

  • 2022-06-11 问题

    设向量组α1=(1,-1,2,4)T,a2=(0,3,1,2)T,α3=(3,0,7,14)T,α4=(1,-2,2,0)T,α5=(2,1,5,10)T,则向量组α1,α2,α3,α4,α5的最大线性无关组是()。 A: α1,α2,α3 B: α1,α2,α4 C: α1,α4 D: α1,α2,α4,α5

    设向量组α1=(1,-1,2,4)T,a2=(0,3,1,2)T,α3=(3,0,7,14)T,α4=(1,-2,2,0)T,α5=(2,1,5,10)T,则向量组α1,α2,α3,α4,α5的最大线性无关组是()。 A: α1,α2,α3 B: α1,α2,α4 C: α1,α4 D: α1,α2,α4,α5

  • 2022-06-08 问题

    执行以下语句的结果:dict1={"x":1,"y":2,"z":3}dict2={"x":4,"a":5}dict1.update(dict2) A: {"x":1,"y":2,"z":3,"x":4,"a":5} B: {"x":4,"a":5,"x":1,"y":2,"z":3} C: 有重复项,结果有误! D: {"x":4,"y":2,"z":3,"a":5}

    执行以下语句的结果:dict1={"x":1,"y":2,"z":3}dict2={"x":4,"a":5}dict1.update(dict2) A: {"x":1,"y":2,"z":3,"x":4,"a":5} B: {"x":4,"a":5,"x":1,"y":2,"z":3} C: 有重复项,结果有误! D: {"x":4,"y":2,"z":3,"a":5}

  • 2022-06-09 问题

    函数\( y = x + \sqrt {1 - x} \)的极大值为( ) A: 0 B: 1 C: \( {5 \over 4} \) D: \( {4 \over 5} \)

    函数\( y = x + \sqrt {1 - x} \)的极大值为( ) A: 0 B: 1 C: \( {5 \over 4} \) D: \( {4 \over 5} \)

  • 2022-06-07 问题

    求不定积分[img=112x35]17da6538063a9e4.png[/img]; ( ) A: (x^4*log(x)^2)/4 + (x^4*(log(x) - 1/4))/ B: (x^4*log(x)^2)/4 - (x^4*(log(x) - 1/4))/8 C: (x^4*log(x)^2)/4 - (x^4*(log(x) - 1/4)) D: (x^4*log(x)^2)/4 + (x^4*(log(x) - 1/4))/8

    求不定积分[img=112x35]17da6538063a9e4.png[/img]; ( ) A: (x^4*log(x)^2)/4 + (x^4*(log(x) - 1/4))/ B: (x^4*log(x)^2)/4 - (x^4*(log(x) - 1/4))/8 C: (x^4*log(x)^2)/4 - (x^4*(log(x) - 1/4)) D: (x^4*log(x)^2)/4 + (x^4*(log(x) - 1/4))/8

  • 2022-07-26 问题

    设有向量组α1=(2,1,4,3)T,α2=(-1,1,-6,6)T,α3=(-1,-2,2,-9)T,α4=(1,1,-2,7)T,α5=(2,4,4,9)T,则向量组α1,α2,α3,α4,α5的秩是 。 A: 1 B: 2 C: 3 D: 4

    设有向量组α1=(2,1,4,3)T,α2=(-1,1,-6,6)T,α3=(-1,-2,2,-9)T,α4=(1,1,-2,7)T,α5=(2,4,4,9)T,则向量组α1,α2,α3,α4,α5的秩是 。 A: 1 B: 2 C: 3 D: 4

  • 2022-06-11 问题

    假设x=4,y=5,下列哪个逻辑表达式是真的? A: !(x==4)^y!=5 B: x!=4^y==5 C: x==5^y==4 D: x!=5^y!=4

    假设x=4,y=5,下列哪个逻辑表达式是真的? A: !(x==4)^y!=5 B: x!=4^y==5 C: x==5^y==4 D: x!=5^y!=4

  • 2022-07-26 问题

    设向量组Αα1=(1,2,1,3)T,α2=(4,-1,-5,-6)T,2)T向量组B:β1=(-1,3,4,7)T,β2=(2,-1,-3,-4)T,试证明;

    设向量组Αα1=(1,2,1,3)T,α2=(4,-1,-5,-6)T,2)T向量组B:β1=(-1,3,4,7)T,β2=(2,-1,-3,-4)T,试证明;

  • 2022-07-23 问题

    如图所示事故树的最小割集为()。[img=171x267]17d608e17919de1.png[/img] A: {x<sub>1</sub>,x<sub>3</sub>},{x<sub>3</sub>,x<sub>4</sub>},{x<sub>1</sub>,x<sub>4</sub>,x<sub>5</sub>} B: {x<sub>1</sub>,x<sub>3</sub>},{x<sub>3</sub>,x<sub>4</sub>},{x<sub>1</sub>,x<sub>5</sub>},{x<sub>2</sub>,x<sub>4</sub>,x<sub>5</sub>} C: {x<sub>3</sub>,x<sub>4</sub>},{x<sub>1</sub>,x<sub>5</sub>},{x<sub>2</sub>,x<sub>4</sub>,x<sub>5</sub>} D: {x<sub>2</sub>,x<sub>3</sub>},{x<sub>1</sub>,x<sub>4</sub>},{x<sub>2</sub>,x<sub>4</sub>,x<sub>5</sub>}

    如图所示事故树的最小割集为()。[img=171x267]17d608e17919de1.png[/img] A: {x<sub>1</sub>,x<sub>3</sub>},{x<sub>3</sub>,x<sub>4</sub>},{x<sub>1</sub>,x<sub>4</sub>,x<sub>5</sub>} B: {x<sub>1</sub>,x<sub>3</sub>},{x<sub>3</sub>,x<sub>4</sub>},{x<sub>1</sub>,x<sub>5</sub>},{x<sub>2</sub>,x<sub>4</sub>,x<sub>5</sub>} C: {x<sub>3</sub>,x<sub>4</sub>},{x<sub>1</sub>,x<sub>5</sub>},{x<sub>2</sub>,x<sub>4</sub>,x<sub>5</sub>} D: {x<sub>2</sub>,x<sub>3</sub>},{x<sub>1</sub>,x<sub>4</sub>},{x<sub>2</sub>,x<sub>4</sub>,x<sub>5</sub>}

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