设函数y = y(x)由参数方程[img=104x61]1803d3431500e23.png[/img]确定，则[img=53x46]1803d3431d68e7b.png[/img]=( )
A: -2
B: -1
C: [img=52x43]1803d34325be995.png[/img]
D: [img=36x43]1803d3432d989a1.png[/img]
A: -2
B: -1
C: [img=52x43]1803d34325be995.png[/img]
D: [img=36x43]1803d3432d989a1.png[/img]
举一反三
- 设函数y = y(x)由参数方程[img=104x61]1803d3461eb81d9.png[/img]确定，则[img=105x56]1803d346275301b.png[/img] A: -2 B: -1 C: [img=52x43]1803d3462eb551c.png[/img] D: [img=36x43]1803d3463748b21.png[/img]
- 求由方程[img=134x41]17da65377a0f91e.png[/img]所确定的隐函数[img=91x50]17da653782b7d9a.png[/img]的导数。 ( ) A: x*exp(y/x) B: x*exp(y/x)*(1/x + y/(x^2*exp(y/x))) C: x*exp(y/x)*(1/x + y/(x^2*exp(y/x)))+x*exp(y/x) D: (1/x + y/(x^2*exp(y/x)))
- 设三阶方阵[img=117x75]17da6265af67565.png[/img]有特征值[img=36x21]17da6265c0f8ef3.png[/img],则[img=26x15]17da6265d451088.png[/img] ,[img=27x17]17da5b7f743dcc3.png[/img] . A: x=1, y=1 B: x=2, y=1 C: x=3, y=0 D: x=0, y=3
- 已知矩阵[img=126x63]18034a7cde5633e.png[/img]相似于矩阵[img=142x71]18034a7ce8de7be.png[/img],则 A: x=-2, y=-1 B: x=2, y=-1 C: x=1,y=-2 D: x=-1,y=-2
- 设随机变量X与Y满足：E(X)=2，E(Y)=3，COV(X,Y)=1，D(X)=1，D(Y)=4．计算[img=82x27]1803194d0539320.png[/img]