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src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F5073f151ebb9762dbf827d04cf10f599.png\">",{"answer":60,"createTime":5,"id":61,"options":62,"question":66,"source":30,"type":31},[],85486848,[63,64,65,11],"10","5","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F10ced756396acb77eaad75c9cf7ff58d.png\">","设二元函数\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F0ecab09d212b3f96ee2a867d9cde394c.png\">,则该函数在点\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F04ff99e5ab1322271d045fbcee471da7.png\">处沿方向\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F9c84cedc82ce6367d7da720b484f5ff0.png\">的方向导数为( )",{"answer":68,"createTime":5,"id":69,"options":70,"question":75,"source":30,"type":31},[],85486849,[71,72,73,74],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb90d19eea88b4ca1177711073035ff36.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F06ac5c0348b8e1b687e6e7e5efc81d3b.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F60c1e3182eda1e1ffc67f24b512c6bb1.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F0e7a2c01952cd47d17a99f5398c06d59.png\">","函数\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F7ba1a084996ac8519d374a769213ee1c.png\">在点(1,-1,1)处方向导数最大值为( )",{"answer":77,"createTime":5,"id":78,"options":79,"question":84,"source":30,"type":31},[],85486850,[80,81,82,83],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fac8ccd03ce14a3f5d2d97851d6f2244c.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F951eb877fd4a7ba435a9feb5023046fe.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F5635b34826c1e98ba3a6e1f897d8ad59.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb992f9accae490b513a8cf5905d91fec.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F7b5c145cfd18de2462149f75d3df9fcb.png\">",{"answer":86,"createTime":5,"id":6,"options":87,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":89,"createTime":5,"id":90,"options":91,"question":94,"source":30,"type":31},[],85486852,[92,57,93,56],"-1","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ffafde7ffc551d96d1a576e919ca6ed6c.png\">","函数 \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fbcfd4c42a09746d1b9ebe6ab259cabb6.png\"> 在点\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F1036dd2ae9c69d7ecb8fd5370719b9ce.png\"> 处沿 \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F9865b44027cc07d64183121222aabadf.png\"> 的方向导数为",{"answer":96,"createTime":5,"id":97,"options":98,"question":103,"source":30,"type":31},[],85486853,[99,100,101,102],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fec28daec64a2f4d0174bd88b77b19d8c.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F38c09f27d329600c0db76abe13e09c16.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F92a3478acd914d716d30ee3313ea82a3.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fa61197ea767e58b89c331bc8d61c462a.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F825fa1ea8812d3e548791526bd8694b0.webp\">"]