百度试题 结果1 题目若f(x,y,z)=ln(xy+z),则 f(1,2,0)=___, f,(1,2,0)=___, f.(1,2,0)=___. 相关知识点: 试题来源: 解析 1,1/2,1/2 反馈 收藏
百度试题 结果1 题目【题目】若 f(x,y,z)=ln(xy+z) ,则 f'_x(1,2,0)=f'_y(1,2,0)=, f'_x(1,2,0)= 相关知识点: 试题来源: 解析 【解析】 1,1/2,1/2 反馈 收藏
设f(x,y,z)=ln(xy+z),则fx(1,2,0)=___. 答案: 1[解析] 你可能感兴趣的试题 [解析] 因为 所以 点击查看答案手机看题 填空题 答案: [解析] 点击查看答案手机看题 填空题 函数 则f(x-1)=___. 答案: x 2 -x+2 [解析] 所以f(x-...
Answer to: Consider the given vector field. F(x, y, z) = ln x, ln xy, ln xyz (a) Find the curl of the vector field. (b) Find the divergence of...
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结果1 题目设f(x,y)=(2x+3y)/(1+ln(1+xy)),则df(0,0)= 相关知识点: 试题来源: 解析 547 【答案】 2dx+3dy 【分析】 由f(x,0)=2x知 f'_x(0,0)=2 同理,由f(0,y)= 3y 知 f'_y(0,0)=3 则 df(0,0)=2dx+3dy.
解:∵z = f ( x , y ) =ln ( xy ) ∴(dz)/(dx)=(df(x,y))/(dx)=1/x,(dz)/(dy)=(df(x,y))/(dy)=1/y=1/(dy)∴dz=1/xdx+1/ydy故答案为:1/xdx+1/ydy已知z = f ( x , y ) =ln ( xy ) ,分别对x,y求偏导,可得(dz)/(dx)=(df(x,y))/(dx)=1/x,(dz)/(dy...
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证明:f(x,y)的定义域D={(x,y):xy>-1},显然f(x,y)在(x,y)∈D,(x≠0)处可导,则一定连续,现在判断f(x,y)在(0,0)处的连续性: lim x,y→0−f(x,y)= lim x,y→0+f(x,y)= lim x,y→0+ ln(1+xy) x= lim x,y→0+ x+y 1+xy...