共50条信息
定积分\(\int_{0}^{1}\dfrac{1}{1{+}x}{dx}\)的值为\((\) \()\)
\(\int_{e}^{a}{\dfrac{1}{x}}dx=3\),则\(a=\)( )
平面直角坐标系中,在直线\(x=1\),\(y=1\)与坐标轴围成的正方形内任取一点,则此点落在曲线\(y=x^{2}\)下方区域的概率为 \((\) \()\)
已知\(n=\int _{1}^{{e}^{6}} \dfrac{1}{x}dx \),那么\((x- \dfrac{3}{x}{)}^{n} \)展开式中含\(x\)\({\,\!}^{2}\)项的系数为
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