• 2022-06-29
    函数[img=110x25]1803a1187e28fd2.png[/img]的傅里叶级数为
    A: [img=146x60]1803a11888abe93.png[/img]
    B: [img=144x60]1803a11893e5b3a.png[/img]
    C: [img=144x60]1803a1189faa562.png[/img]
    D: [img=146x60]1803a118a966322.png[/img]