xyx2y2不存在。 因而f(x,y)在(0,0)处不连续。 综上所述:f(x,y)在(0,0)处不连续,但偏导数存在。 故选:C. 根据二元函数偏导数和连续的定义即可求解. .sf-sub-indicator{top:.8em;background-position:-998px -100px}a:active>.sf-sub-indicator,a:focus>.sf-sub-indicator,a:hover...
关于x,y的二元一次方程组left(begin(array)l(2x+3y=3k)\(x+2y=k-2)end(array)right.(1)当方程组的解的和为4时,求k
在\displaystyle(2k\pi+\frac{\pi}{2},2k\pi+\frac{3\pi}{2})(k\in Z)上单调递减。 ⑥最值: 当\displaystyle x=2k\pi+\frac{\pi}{2}时,\displaystyle y_{max}=1; 当\displaystyle x=2k\pi+\frac{3\pi}{2}时,\displaystyle y_{min}=-1; ⑦有界性:\displaystyle\left| sinx \right|\l...
∫xx2−a2dx=x2−a2−asec−1(ax)+C Explanation: For the integral ... How do you find the integral of x(3+x2)dx ? https://socratic.org/questions/how-do-you-find-the-integral-of-dx-x-sqrt-3-x-2 ∫x3+x2dx=31ln∣∣∣...
評估 x2−2∣x∣−3 對x 微分 2(x−sign(x)) 圖表
{{x}^{2}}+4{{y}^{2}}+4xy-6{{z}^{2}} D. {{x}^{2}}+2{{y}^{2}}+2xy-9{{z}^{2}} 相关知识点: 试题来源: 解析 B 原式={{\left( x+2y \right)}^{2}}-{{\left( 3z \right)}^{2}}={{x}^{2}}+4xy+4{{y}^{2}}-9{{z}^{2}}故选B....
11.用代入消元法解下列方程组:(1)$\left\{\begin{array}{l}{x-3y=2}\\{y=x}\end{array}\right.$,(2)$\left\{\begin{array}{l}{x+y=5}\\{2x+y=8}\end{array}\right.$,(3)$\left\{\begin{array}{l}{4x+3y=5}\\{x-2y=4}\end{array}\right.$,(4)$\left\{\begin{array}{...
若(3xy)^left | m right |-(m-2)xy-1是关于x,y的三次三项式,则m=___.相关知识点: 试题来源: 解析 解: 由题意得:left { {{begin{array}{ll} {left | {m} right |=2} \ {-left ( {m-2} right )neq 0} end{array}}} right . 解得:m=-2 故答案为:-2反馈...
9.已知关于x.y的二元一次方程组$\left\{\begin{array}{l}{3x-ay=5}\\{x+by=11}\end{array}\right.$的解为$\left\{\begin{array}{l}{x=5}\\{y=6}\end{array}\right.$.那么关于x.y的二元一次方程组$\left\{\begin{array}{l}{3=5}\\{x+y+b(x-y)=11}\end{array}\right.$的解...
https://socratic.org/questions/how-do-you-simplify-x-3-x-8 See the entire simplification process below: Explanation: To multiply these two terms you multiply each individual term in the left parenthesis by each individual term in the right parenthesis. ((x)+(3))((x)−(8)) ....