• 2021-04-14
    已知图中所示方波的傅里叶级数为 则波形f2(t)取至九次谐波为止的傅里叶级数为/sqp/img?f=50b0f72a20783aad58cc7eea8ff2903f.files%2Fimage013.jpg/sqp/img?f=50b0f72a20783aad58cc7eea8ff2903f.files%2Fimage014.jpg