∴1.计算下列各定积分. x) \int_{\pi}^{2 \pi}(\sin x-1)dx; xf \int_{0}^{1}(2x-1)^{10}dx; ; \int_{-1}^{0}\dfrac{x}{x^{2}+1}dx; \int_{0}^{1}xe^{x}dx; \int_{1}^{e}\ln xdx; 6) \int_{-1}^{1}|x|dx. . ...