由 x=3[img=11x17]17e437fdc5ca554.jpg[/img],y=2[img=11x17]17e440be629dccb.jpg[/img]所确定的函数y=y（x）的导数是（）
举一反三
- y=sint, x=[img=11x17]17e0aa5dde55a0f.jpg[/img],则y对x的导数y'(x)=( ) 未知类型：{'options': ['cost', ' 2t', ' [img=34x34]17e0aaf40f11485.jpg[/img]', ' [img=34x33]17e0aaf41870cfe.jpg[/img]'], 'type': 102}
- 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)))
- 求微分方程[img=143x21]17da5f14490e50e.png[/img]的通解,实验命令为(). A: dsolve(D2y-2*Dy+5*y=sin(2*x),x)ans =exp(x)*sin(2*x)*C2+exp(x)*cos(2*x)*C1+1/17*sin(2*x)+4/17*cos(2*x) B: dsolve('D2y-2*Dy+5*y=sin(2*x)','x')ans =cos(2*x)*(sin(4*x)/17 - cos(4*x)/68 + 1/4) - sin(2*x)*(cos(4*x)/17 + sin(4*x)/68) + C1*cos(2*x)*exp(x) - C2*sin(2*x)*exp(x) C: dsolve(D2y-2*Dy+5*y=sin(2*x),'x','y')ans =exp(x)*sin(2*x)*C2+exp(x)*cos(2*x)*C1+1/17*sin(2*x)+4/17*cos(2*x)
- If<em>x</em>-9=2<em>y</em>and<em>x</em>+3=5<em>y</em>,whatisthevalueof<em>x</em>? A: -2 B: 4 C: 11 D: 15 E: 17
- Whatistheintersectionpointforthegraphsofthelines<em>y</em>=2<em>x</em>+7and<em>y</em>=3<em>x</em>+2? A: (9,25) B: (5,17) C: (-17,-5) D: (17,-7) E: (-7,17)