16y()=f()* h()= f(r)h(t-r)dr则f(-t)*h(-tf(t) h()=f(3t)*h(3t)= 16y()=f()* h()= f(r)h(t-r)dr则f(-t)*h(-tf(t) h()=f(3t)*h(3t)= 发布时间:2025-08-21 18:04:58