• 2022-06-26
    设[img=34x25]1802cf1f7ee7f58.png[/img]为区间[img=55x25]1802cf1f8875e49.png[/img]内的偶函数,若[img=34x25]1802cf1f7ee7f58.png[/img]在区间[img=55x25]1802cf1f8875e49.png[/img]内可导,则其导函数[img=39x26]1802cf1fa1c1559.png[/img]必为[img=55x25]1802cf1f8875e49.png[/img]内的偶函数.
  • 举一反三