真 工數答案

[machineboy (不爽啊...)]

1.3:(4)y=sinx+c*cosx
    (6)y=(x-2)^2/4(x+1) + c/(x+1)(x-2)^4
    (9)y=x^3/4 + x + c/x
    (13)x=ce^(-2y) + ye^(-2y)
    (18)y=x^2*(x-2)ln(x-2)e^(-x) + 2x^2(x-2)e^(-x)
    (22)y=-x/4 - 1/16 - 4sinx/17 - cosx/17 + 849e^(4x)/272

1.5:(5)(a)My=0,Nx=3 (b)v(y)=e^3y (c)xe^3y - e^y=c
    (8)(a)My=2y+1,Nx=-1 (b)v(y)=1/y^2 (c)xy+x=cy (d)y=0 is a singular solution
    (13)(a)My=1-4y^3,Nx=0 (b)The hint produces u(x,y)=e^-3y*y^-4
        (c)y^3-1=k*y^3*e3x
    (19)v(y)=1/y;x^2 + 3ln|y|=c;y=4e^(-x^2/3)
    (22)v(y)=1/y;x^3 + xy^2 =c;x^3 + xy^2=10
    (27)懶得打

1.6要出門了...掰掰

--
 清流？                     ╖     ◎             ╖         唉啊~我是濁流啦~
 ╭○╯☆ ╦╦╮╭═╮╭═╮╠═╮ ╖ ╦═╮╭═╮╠═╮╭═╮╖  ╖  ○ˊ
  （╱    ║║║║  ║║    ║  ║ ║ ║  ║╠═╛║  ║║  ║║  ║  <）
   ╰     ╜  ╜╰═╙╰═╯╨  ╨ ╨ ╨  ╨╰═╯╚═╯╰═╯╰═╣ ˊ╯
          ψlaarman                                           ╘═╯

--
※ 發信站: 批踢踢實業坊(ptt.cc) 
◆ From: 140.112.247.219
→ hajimez:喔喔!!