y3 3xy2dy
后天交作业,请大侠相助!求微分方程(x3+y3)dx - 3xy2dy=0...
(x^3 + y^3)dx - 3xy^2dy = 0y = 0 是一个解。当y不恒等于0时，x^3dx = 3xy^2dy - y^3dx,xdx = [3xy^2dy - y^3dx]/x^2,d[x^2/2] =...
dy/dx=y3/(x3+xy2)求通解
∵令y=xt,则dy/dx=xdt/dx+t代入原方程,化简得 xdt/dx+t=t^3/(1+t^2)==>(1/t+t)dt+dx/x=0==>ln│t│+t^2/2+ln│x│=ln│C│ (C是常数)==...
计算:(1)( - 3xy2)3(16x3y)2;(2)4a2x2( - 25a4x3...
(1)(-3xy2)3 (16x3y)2,=-27x3y6 136x6y2,=-34x9y8;(2)4a2x2 (-25a4x3y3)÷(-12a5xy2),=4a2x2 (-25)a4x3y3÷(-12)a5xy2,=165ax4y;(3)(2x-...
...③(x3y2)÷(x2y3)=xy; ④3b34b4=12b12; ⑤(3xy...
解答:解:①an an=a2n; ②a6+a6=2a6; ③(x3y2)÷(x2y3)=xy-1=xy; ④3b3 4b4=12b7; ⑤(3xy3)2=9x2y6;⑥(-2x)2x3=4x5.则...
编写一段python 代码,画出函数: z=x3+ y3+x2+ y2+xy的...
编写一段python 代码，画出函数: z=x3+ y3+x2+ y2+xy的 3D图先贴上图片使用的python工具包为：from matplotlib import pyplot as pltimp...
(x3 - y3)dx+xy2dy
应该是x3+y3=1000，x2y－xy2=－496（x3－y3）+（4xy2－2x2y）－2（xy2－y3）=x^3-y^3+4xy^2-2x^2y-2xy^2+2y^3=x^3+y^3+2xy^2-2x^2y=(x^3+y...
(x+y)dx - 3xydy=0的通解?
解答 x3dx=3xy2dy-y3dx x3dx=xdy3-y3dx xdx=dy3/x+y3d(1/x)通解x2/2=y3/x+C
...1,求代数式(x3+3x2y - 5xy2+6x3+1) - (2x3 - y3 - 2xy2 - x2y...
原式=x3+3x2y-5xy2+6x3+1-2x3+y3+2xy2+x2y+2-4x2y-7x3-y3+4xy2+1=-2x3+xy2+4,由于y为偶次幂,故误把“x=3,y=-1”写成“x=3,y=1”,但其计算...
如果x+y= - 3,xy= - 2,那么x3y2+x2y3的值为 - - - .
解答:解:∵x3y2+x2y3=x2y2(x+y),而x+y=-3,xy=-2,∴x3y2+x2y3=4×(-3)=-12.故答案为:-12.
x3+y3+z3 - 3xyz=(x+y+z)(x2+y2+z2 - xy - yz - xz)这些常用的...
x3+y3+z3-3xyz=(x+y+z)(x2+y2+z2-xy-yz-xz)这些常用的等式或不等式还有哪些问在线客服扫码问在线客服1+2+3+4+5+6+7+8+9+…...