y-2[y-4(y-1)]-8=0

y-2[y-4(y-1)]-8=0 方程y''-4y'+13y=0的通解方程y''=(1+y'*y')/2y的通解 [T,Y]=ode45(@rigid,[0 1],[rand(15,1)]);plot(T,Y(:,1),'-',T,Y(:,2),'-.',T,Y(:,3),'.',T,Y(:,4),'-',T,Y(:,5),'-.',T,Y(:,6),'.',T,Y(:,7),'-',T,Y(:,8),'-.',T,Y(:,9),'.',T,Y(:,10),'-',T,Y(:,11),'-.',T,Y(:,12),'-.',T,Y(:,13),'.',T,Y(:,14),'-',T,Y(:,15),'.') 已知y^2+7y-1=0,求y^8-7y^4+1/y^4 已知y^2+3y-1=0 求（y^8-3y^4+1)/y^4的值 已知y^2+3y-1=0,求y^4/y^8-3y^4+1的值 已知y^2+3y-1=0求y^4/y^8+3y^4+1的值 已知y^2+3y-1=0,求y^4/y^8-3y^4+1的值 y- 2y+1/2=9- 8-y/4 y-2y+1/2=9-8-y/4 2y+8y-1=0 已知(3x+1)(3x-3)-3x+2)^2=-7,(y+7)(y-7)-y(y-7)=0,求8y^2-5y(-y+3x)+4y(-4y-5/2x)的值 常微分方程的通解dy/dx=(x-y+1)/(x+y-3)y^4=2y^n+y=0y''+6y'+9y=e^(-3x)y''+y'-2y=4e^(2x) 求下列微分方程的通解或特解：(1) 3y''-2y'-8y=0 (2) 4y-8y'+5y=0(3) y+4y'+29y=0,y|(下角x=0)=0,y'|(下角x=0)=15(4) 2y+5y'=5x^2-2x-1 y^+3y-1=0,求y^4/^8-3y^4+1的值 如果|x-y+1|+y^2-4y+4=0,求出x,y的值 4Y^3+3Y^2+4Y+1=0求Y 急,看不懂问我(y+3)^2/8-y=(y+3)/4-(y-1)/2