(2y+1)-8(2y+1)+15 = 0

(y-2)(y^2-6y-9)-y(y^2-2y-15),其中y=1/2.先化简再求值. y (3y^2+8y-3)-6y(3y+2y-1)+9y [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),'.') 方程y''=(1+y'*y')/2y的通解 y- 2y+1/2=9- 8-y/4 y-2y+1/2=9-8-y/4 y-2[y-4(y-1)]-8=0 y'=1+y^2 y(y-2)²-y(y+3)(y-5) y=1/2 化简求值 y(y-2)²-y(y+3)(y-5) y=1/2 化简求值 y(y-2)²-y(y+3)(y-5) y=1/2 化简求值 2y+8y-1=0 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 已知y=-2,求2y-2/y^2-2y+1+y+1/y-1-y的值 (2y+1)-8(2y+1)+15 = 0 方程y''-4y'+13y=0的通解方程y''=(1+y'*y')/2y的通解 急,看不懂问我(y+3)^2/8-y=(y+3)/4-(y-1)/2 x+(9-8-y)=10 y+y-(9-8-y)=2 x-y=xx-9.9x xy=11y-1 y=? x=? x+y-xy=?x+(9-8-y)=10y+y-(9-8-y)=2x-y=xx-9.9xxy=11y-1 y=?x=?x+y-xy=?