• 2022-06-29
    函数[img=110x25]1803a188d769d66.png[/img]的傅里叶级数为
    A: [img=146x60]1803a188e2ac19d.png[/img]
    B: [img=144x60]1803a188ed753b9.png[/img]
    C: [img=144x60]1803a188f7ca00b.png[/img]
    D: [img=146x60]1803a189024007e.png[/img]