发布网友 发布时间:2022-04-23 21:08
共2个回答
热心网友 时间:2022-06-04 02:35
展开1全部这个很简单的,你可以在你酒店房间里面用电话直接给前台打电话,问你们酒店都有什么服务。热心网友 时间:2022-06-04 02:36
=-(1/2)∫(x 1)dx/(x^2 1) ∫dx/x-(1/2)∫dx/(x 1)
=-(1/2)∫xdx/(x^2 1)-(1/2)∫dx/(1 x^2)-lnx-(1/2)ln(x 1)
=-(1/4)∫d(x^2 1)/(x^2 1)-(1/2)arctanx-lnx-(1/2)ln(x 1)
=-(1/4)ln(1 x^2)-lnx-(1/2)ln(x 1)-(1/2)arctanx c
=-ln[(1 x^2)^(1/4)*x*(x 1)^(1/2)]-(1/2)arctanx c.