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第2017题:小技巧



计算不定积分 x3(x1)60dx \int \dfrac{x^3}{(x-1)^{60}} dx .




A. 157(x1)57+358(x1)58\dfrac{1}{57(x-1)^{57}}+\dfrac{3}{58(x-1)^{58}} +159(x1)59+C+\dfrac{1}{59(x-1)^{59}}+C



B. 156(x1)56+357(x1)57\dfrac{1}{56(x-1)^{56}}+\dfrac{3}{57(x-1)^{57}} +358(x1)58+\dfrac{3}{58(x-1)^{58}} +159(x1)59+C+\dfrac{1}{59(x-1)^{59}}+C



C.157(x1)57358(x1)58 -\dfrac{1}{57(x-1)^{57}}-\dfrac{3}{58(x-1)^{58}} 159(x1)59+C-\dfrac{1}{59(x-1)^{59}}+C



D. 156(x1)56357(x1)57-\dfrac{1}{56(x-1)^{56}}-\dfrac{3}{57(x-1)^{57}}358(x1)58 -\dfrac{3}{58(x-1)^{58}} 159(x1)59+C-\dfrac{1}{59(x-1)^{59}}+C




提示:x=x-1+1.
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