84.已知y()=f()* h()= f(r)h(t-r)dr则f(-t)*h(-tf(t) h()=f(3t)*h(3t)=
84.已知y()=f()* h()= f(r)h(t-r)dr则f(-t)*h(-tf(t) h()=f(3t)*h(3t)=
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