• 2022-06-19 问题

    f(x)=x2+bx+c,x∈R,有f(2+x)=f(2-x),则( ) A: f(1)<f(2)<f(4) B: f(2)<f(4)<f(1) C: f(4)<f(2)<f(1) D: f(2)<f(1)<f(4) E: f(1)<f(4)<f(2)

    f(x)=x2+bx+c,x∈R,有f(2+x)=f(2-x),则( ) A: f(1)<f(2)<f(4) B: f(2)<f(4)<f(1) C: f(4)<f(2)<f(1) D: f(2)<f(1)<f(4) E: f(1)<f(4)<f(2)

  • 2022-05-26 问题

    设函数f(x)在区间&#91;-2,2&#93;上可导,且f′(x)>f(x)>0,则()。 A: f(-2)/f(-1)>1 B: f(0)/f(-1)>e C: f(1)/f(-1)<e<sup>2</sup> D: f(2)/f(-1)<e<sup>2</sup>

    设函数f(x)在区间&#91;-2,2&#93;上可导,且f′(x)>f(x)>0,则()。 A: f(-2)/f(-1)>1 B: f(0)/f(-1)>e C: f(1)/f(-1)<e<sup>2</sup> D: f(2)/f(-1)<e<sup>2</sup>

  • 2022-10-24 问题

    设有符合函数y=f&#91;φ2(x)ψ(ex)&#93;,其中函数f,φ,ψ都可微分,则dy=()。 A: f′·(2φφ′ψ+φψ′e) B: f′·(2φφ′ψ+φψ′e)dx C: f′·(2φψ+φψ′)dx D: f′·(2φψ+φψ′)

    设有符合函数y=f&#91;φ2(x)ψ(ex)&#93;,其中函数f,φ,ψ都可微分,则dy=()。 A: f′·(2φφ′ψ+φψ′e) B: f′·(2φφ′ψ+φψ′e)dx C: f′·(2φψ+φψ′)dx D: f′·(2φψ+φψ′)

  • 2022-06-07 问题

    设函数f(x)=a|x|(a>0),且f(2)=4,则(  ) A: f(-1)>f(-2) B: f(1)>f(2) C: f(2)<f(-2) D: f(-3)>f(-2)

    设函数f(x)=a|x|(a>0),且f(2)=4,则(  ) A: f(-1)>f(-2) B: f(1)>f(2) C: f(2)<f(-2) D: f(-3)>f(-2)

  • 2022-05-29 问题

    ‏多面体的欧拉公式是:‎ A: V–F + E = 2 B: V–F–E = 2 C: V + F–E = 2 D: V + F–E = 1

    ‏多面体的欧拉公式是:‎ A: V–F + E = 2 B: V–F–E = 2 C: V + F–E = 2 D: V + F–E = 1

  • 2022-06-07 问题

    设f(x)=x2+bx+c且f(0)=f(2),则(  ) A: f(-2)<c<f(32) B: f(32)<c<f(-2) C: f(32)<f(-2)<c D: c<f(32)<f(-2)

    设f(x)=x2+bx+c且f(0)=f(2),则(  ) A: f(-2)<c<f(32) B: f(32)<c<f(-2) C: f(32)<f(-2)<c D: c<f(32)<f(-2)

  • 2022-06-08 问题

    f(x)=xln2x在x0处可导,f'(x0)=2, 则f(x0)=( ) A: 1 B: e/2 C: 2/e D: e^2

    f(x)=xln2x在x0处可导,f'(x0)=2, 则f(x0)=( ) A: 1 B: e/2 C: 2/e D: e^2

  • 2021-04-14 问题

    f(x)在[0,1]上有连续的二阶导数,f(0)=f(1)=0,任意x属于[0,...715af2ac3f81f8.png"]

    f(x)在[0,1]上有连续的二阶导数,f(0)=f(1)=0,任意x属于[0,...715af2ac3f81f8.png"]

  • 2021-04-14 问题

    【多选题】若f 1 (t) = ɛ (-t) , f 2 (t) = e t ,则f 1 (t)* f 2 (t) = A. f 1 ꞌ (t)* f 2 (–1) (t) B. f 1 (–1) (t)* f 2 ꞌ (t) C. f 1 (t-3)* f 2 (t+3) D. f 1 (–3) (t)* f 2 ꞌꞌꞌ (t)

    【多选题】若f 1 (t) = ɛ (-t) , f 2 (t) = e t ,则f 1 (t)* f 2 (t) = A. f 1 ꞌ (t)* f 2 (–1) (t) B. f 1 (–1) (t)* f 2 ꞌ (t) C. f 1 (t-3)* f 2 (t+3) D. f 1 (–3) (t)* f 2 ꞌꞌꞌ (t)

  • 2022-06-18 问题

    已知\( y = {f^2}(x) \),假设\( f(u) \)二阶可导,则 \( y'' \)为( ). A: \( 2{[f'(x)]^2} + 2f(x)f'(x) \) B: \( 2[f'(x)] + 2f(x)f''(x) \) C: \( 2{[f'(x)]^2} + 2f(x)f''(x) \) D: \( 2{[f'(x)]^2} + f(x)f''(x) \)

    已知\( y = {f^2}(x) \),假设\( f(u) \)二阶可导,则 \( y'' \)为( ). A: \( 2{[f'(x)]^2} + 2f(x)f'(x) \) B: \( 2[f'(x)] + 2f(x)f''(x) \) C: \( 2{[f'(x)]^2} + 2f(x)f''(x) \) D: \( 2{[f'(x)]^2} + f(x)f''(x) \)

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