若u(x),v(x)在[a,b]上具有连续导数,则u(xd(x)= u(x )v(xv(x)du(x 若u(x),v(x)在[a,b]上具有连续导数,则u(xd(x)= u(x )v(xv(x)du(x 发布时间:2025-07-24 08:32:02