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src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F39f85fd56771d370a23141cca3fbe4de.png\">, \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fff5d437aff1cd58bf8cf8c0455734b78.png\"> 有一阶连续的偏导数, 则\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F69efe25a09c323b9aac7dc1e42b54039.png\">",{"answer":58,"createTime":5,"id":59,"options":60,"question":65,"source":28,"type":29},[],80191434,[61,62,63,64],"-4","4","-12","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F6726e0c8614eb0cd9aa0b6bf54ce6cdb.png\">","函数 \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F9efd3c158ee7001e870b3ef142230394.png\"> 在点 \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F3574e7bd29b223d6f0a2305c4a3cc83b.png\"> 处沿 \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ff6ead3da824ce26140d0610caf75846e.png\">的方向导数为\u003Cimg 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