曲面z=x+y,z=xy,x+y=1,x=0.y=0所围的体积为[img=24x41]17e43622ac90eb3.png[/img]。
举一反三
- z=x+y,z=xy,x+y=1,x=0,y=0所围成图形的体积为()。
- 以下选项错误的是 A.main() { int x,y,z; x=0;y=x-1; z=x+y;} B.main() { int x,y,z; x=0,y=x+1; z=x+y;} C.main() { int x;int int y; x=0,y=x+1; z=x+y;} D.main() { int x,y,z; x=0;y=x+1; z=x+y,}
- int x=1, y=2, z=0; z= x > y ? x+y : x; 则z= ( )
- 绘制函数 z=(x+y)^2 的曲面图 A: x=-3:0.1:3; y=-3:0.1:3; z=(x+y)^2; surf(x,y,z) B: x=-3:0.1:3; y=-3:0.1:3; z=(x+y).^2; surf(x,y,z) C: x=-3:0.1:3; y=-3:0.1:3; z=(x+y).^2; meshgrid(x,y,z); surf(x,y,z) D: x=-3:0.1:3; y=-3:0.1:3; [X,Y]=meshgrid(x,y); Z=(X+Y).^2; surf(X,Y,Z)
- 设函数z=f(x,y)=xy/(x2+y2),则下列结论中不正确的是() A: f(1,y/x)=xy/(x+y) B: f(1,x/y)=xy/(x+y) C: f(1/x,1/y)=xy/(x+y) D: f(x+y,x-y)=xy/(x+y)