• 2022-06-18 问题

    求多项式[img=258x27]17de9124b2c58e4.png[/img]中变量[img=11x14]17de5fbe7011053.png[/img]的最高次幂系数应输入 A: poly=(x^2*y+2y)^3+5x^6*y^2+2x^2Coefficient[poly,x^[Exponent[poly,x]]] B: poly=(x^2*y+2y)^3+5x^6*y^2+2x^2Coefficient[poly,x^(Exponent[poly,x])] C: poly=(x^2y+2y)^3+5x^6y^2+2x^2Coefficient[poly,x^[Exponent[poly,x]]] D: poly=(x^2*y+2y)^3+5x^6*y^2+2x^2Exponent[poly,x];Coefficient[poly,%]

    求多项式[img=258x27]17de9124b2c58e4.png[/img]中变量[img=11x14]17de5fbe7011053.png[/img]的最高次幂系数应输入 A: poly=(x^2*y+2y)^3+5x^6*y^2+2x^2Coefficient[poly,x^[Exponent[poly,x]]] B: poly=(x^2*y+2y)^3+5x^6*y^2+2x^2Coefficient[poly,x^(Exponent[poly,x])] C: poly=(x^2y+2y)^3+5x^6y^2+2x^2Coefficient[poly,x^[Exponent[poly,x]]] D: poly=(x^2*y+2y)^3+5x^6*y^2+2x^2Exponent[poly,x];Coefficient[poly,%]

  • 2022-06-03 问题

    求下列函数的导数:1.y=2.y=2xtanx3.y= A: x^(-2/3)+4x^(-3) B: 2tanx+2x(secx)^2 C: (x^2+2x)/(1+x)^2

    求下列函数的导数:1.y=2.y=2xtanx3.y= A: x^(-2/3)+4x^(-3) B: 2tanx+2x(secx)^2 C: (x^2+2x)/(1+x)^2

  • 2022-06-14 问题

    当x→0时,与3x^2+2x^3等价的无穷小量是()。 A: 2x^3 B: 3x^2 C: x^2 D: x^3

    当x→0时,与3x^2+2x^3等价的无穷小量是()。 A: 2x^3 B: 3x^2 C: x^2 D: x^3

  • 2022-06-08 问题

    以下哪个Q[x]中的最简分式?() A: (x-1)/(x+1) B: (x^2+2x)/x^4 C: (x-1)/(x^2+2)^2 D: x^5/(x^2-1)

    以下哪个Q[x]中的最简分式?() A: (x-1)/(x+1) B: (x^2+2x)/x^4 C: (x-1)/(x^2+2)^2 D: x^5/(x^2-1)

  • 2022-06-18 问题

    函数y=x^2+2x与y=x^2-2x的图像

    函数y=x^2+2x与y=x^2-2x的图像

  • 2022-06-18 问题

    lim(x趋近于正无穷)[根号下(x^2+2x)-x]

    lim(x趋近于正无穷)[根号下(x^2+2x)-x]

  • 2022-06-09 问题

    设\(z = \int_ { { x^2}}^y { { e^t}\sin t} dt\),则\({z_{xx}=}\) A: \(2{e^ { { x^2}}}\left[ {\left( {1 + 2{x^2}} \right)\sin {x^2} + 2{x^2}\cos {x^2}} \right]\) B: \( - 2{e^ { { x^2}}}\left[ {\left( {1 + 2{x^2}} \right)\sin {x^2} - 2{x^2}\cos {x^2}} \right]\) C: \( - 2{e^ { { x^2}}}\left[ {\left( {1 + 2{x^2}} \right)\sin {x^2} + 2{x^2}\cos {x^2}} \right]\) D: \( - 2{e^ { { x^2}}}\left[ {\left( {1 + 2{x^2}} \right)\cos {x^2} + 2{x^2}\sin {x^2}} \right]\)

    设\(z = \int_ { { x^2}}^y { { e^t}\sin t} dt\),则\({z_{xx}=}\) A: \(2{e^ { { x^2}}}\left[ {\left( {1 + 2{x^2}} \right)\sin {x^2} + 2{x^2}\cos {x^2}} \right]\) B: \( - 2{e^ { { x^2}}}\left[ {\left( {1 + 2{x^2}} \right)\sin {x^2} - 2{x^2}\cos {x^2}} \right]\) C: \( - 2{e^ { { x^2}}}\left[ {\left( {1 + 2{x^2}} \right)\sin {x^2} + 2{x^2}\cos {x^2}} \right]\) D: \( - 2{e^ { { x^2}}}\left[ {\left( {1 + 2{x^2}} \right)\cos {x^2} + 2{x^2}\sin {x^2}} \right]\)

  • 2022-06-07 问题

    求不定积分[img=132x48]17da6537fc8dad6.png[/img]; ( ) A: -(4*(cos(x/2)/2 + 2*sin(x/2)))/(17*exp(2*x)) B: (4*(sin(x/2)/2 + 2*sin(x/2)))/(17*exp(2*x)) C: (4*(cos(x/2)/2 + 2*sin(x/2)))/(17*exp(2*x)) D: (4*(cos(x/2)/2 + 2*cos(x/2)))/(17*exp(2*x))

    求不定积分[img=132x48]17da6537fc8dad6.png[/img]; ( ) A: -(4*(cos(x/2)/2 + 2*sin(x/2)))/(17*exp(2*x)) B: (4*(sin(x/2)/2 + 2*sin(x/2)))/(17*exp(2*x)) C: (4*(cos(x/2)/2 + 2*sin(x/2)))/(17*exp(2*x)) D: (4*(cos(x/2)/2 + 2*cos(x/2)))/(17*exp(2*x))

  • 2022-06-19 问题

    与数学关系式[img=114x22]1803bce8722f322.png[/img]等价的C语言关系表达式是? A: x < -2 && x > 2 B: x < -2 || x > 2 C: -2 < x < 2 D: !(-2 <= x <=2) E: !(-2 <=x && x <= 2) F: x < -2, x > 2

    与数学关系式[img=114x22]1803bce8722f322.png[/img]等价的C语言关系表达式是? A: x < -2 && x > 2 B: x < -2 || x > 2 C: -2 < x < 2 D: !(-2 <= x <=2) E: !(-2 <=x && x <= 2) F: x < -2, x > 2

  • 2022-06-11 问题

    求函数[img=148x49]17da6537a5eee98.png[/img]的导数; ( ) A: 1/(x^2*(2/x^2 + 1)) B: -1/(x^2*(2/x^2 + 1)) C: (x^2*(2/x^2 + 1)) D: -1/(x^2*(2/x^2 + 1))+2/x^2 + 1

    求函数[img=148x49]17da6537a5eee98.png[/img]的导数; ( ) A: 1/(x^2*(2/x^2 + 1)) B: -1/(x^2*(2/x^2 + 1)) C: (x^2*(2/x^2 + 1)) D: -1/(x^2*(2/x^2 + 1))+2/x^2 + 1

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