题目内容
设z=x2+y2,则在点（0,0）处取极大值
查看答案
搜索结果不匹配？点我反馈
更多问题
闭域必为闭集
若重极限不存在，则累次极限不存在
若f(x,y)不连续，则f(x,y)对x和y都不连续
填阿拉伯数字：In August 2003, Europe, particularly France, had one of its worst heatwaves ever. The temperature was sometimes more than degrees. Because of this, many people died. On one night, August 10th, between and people died. In total, more than people died in Europe, including in France.
微信支付 
支付宝支付