• 2022-06-15
    若不定积分∫f(x)dx=x2+c,则不定积分∫xf(1-x2)dx=().(A)-2(1-x2)2+c(B)2(1-x2)2+c(C)(D)若不定积分∫f(x)dx=x2+c,则不定积分∫xf(1-x2)dx=(  ).
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      若\( \int {f(x)dx = {x^2} + C} \),则\( \int {xf(1 - {x^2})dx = } \)( ) A: \( 2{(1 - {x^2})^2} + C \) B: \( - {1 \over 2}{(1 - {x^2})^2} + C \) C: \( {1 \over 2}{(1 - {x^2})^2} + C \) D: \( - 2{(1 - {x^2})^2} + C \)

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      设函数f(x)连续,则积分区间(0-x),d/dx{∫tf(x^2-t^2)dt}=() A: 2xf(x^2) B: -2xf(x^2) C: xf(x^2) D: -xf(x^2)

    • 2

      求不定积分∫(arctan(1/x)/(1+x^2))dx

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      不定积分[f′(x)/(1+[f(x)]2)]dx等于() A: ln|1+f(x)|f+c B: (1/2)1n|1+f(x)|+c C: arctanf(x)+c D: (1/2)arctanf(x)+c

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      不定积分[f′(x)/(1+[f(x)]2)]dx等于() A: ln|1+f(x)|f+c B: (1/2)1n|1+f2(x)|+c C: arctanf(x)+c D: (1/2)arctanf(x)+c