• 2022-05-29
    曲线[img=54x17]17e0a89d8cf6cd3.jpg[/img]在[img=38x30]17e0a89d9560ac1.jpg[/img]处切线的斜率是()
    未知类型:{'options': ['0', ' -1', ' 1', ' [img=52x78]17e0a89da090d27.png[/img]'], 'type': 102}