更多"解方程xy′-y=x3."的相关试题:
[单项选择]设A是m×s矩阵,曰是s×n矩阵,则方程组ABx=0与方程组Bx=0是同解方程组的充分条件是
(A) r(A)=n. (B) r(A)=s. (C) r(B)=s. (D) r(B)=n.
[简答题]设A是实矩阵,证明:
ATAx=0与Ax=0是同解方程组;
[填空题]设连续函数y=y(x)是由方程2y3-2y2+2xy+y-x2=0所确定,则y=y(x)的唯一驻点为x=______,它是y(x)的极______值点,此极______值为______.
[简答题]已知函数的全微分df(x,y)=(3x2+4xy-y2+1)dx+(2x2-2xy+3y2-1)dy,则f(x,y)=______.
[简答题]求微分方程(y4-2xy)y’=y2+1满足初始条件y(0)=0的特解.
[单项选择]化简(x2+xy+y2)2-4xy(x2+y2)的结果应为()。
A. (x2+xy+y2)2
B. (x2-xy+y2)2
C. (x2-2xy+2y2)2
D. (x2+xy-2y)2
[简答题]设y=y(x)由方程X2+2y3+2xy+3y-x=1确定,求y’.
[简答题]求微分方程x2y’+xy=y2满足初始条件y(1)=1的特解.
[简答题]求函数f(x,y)=x2+xy+y2-3x-6y的极值.
[简答题]求函数f(x,y)=x2+xy+y2+x-y+2的极值.