Answer to: The differential equation y + 4y^5 = (y^3 +4x)y' can be written in differential form: M(x,y) dx + N(x,y) dy = 0 By signing up, you'll...
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26、Vxdy=4ydx+(4x+1)dy= d=dx+dy=-Vydx+Vxdy= 4ydx+(4x+1)dy=4xy+y6-2 平面不可压缩流体速度分布:Vx=x2-y2+x; Vy=-(2xy+y).(1) 流动满足连续性方程否? (2) 势函数、流函数存在否? (3)求、 .解:(1)由于+=2x1(2x1)0,故该流动满足连续性方程,流动存在.(2)由z=()=0, 故流...
A. ydx+xdy B. xdx+ydy C. x(dx+dy) D. dx+dy 查看完整题目与答案 z=F(x,y,z) 的一个法向量为 A. {Fx,Fy,Fz-1} B. {Fx-1,Fy-1,Fz-1} C. {Fx,Fy,Fz} D. {-Fx,-Fy,Fz} 查看完整题目与答案 设可微函数f(x,y)在点(x₀,y。)取得极小值,则下列结论正确的...
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