y-2y+1/2=9-8-y/4

y- 2y+1/2=9- 8-y/4 y-2y+1/2=9-8-y/4 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),'.') y-2[y-4(y-1)]-8=0 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) (y-2)(y^2-6y-9)-y(y^2-2y-15),其中y=1/2.先化简再求值. 方程y''-4y'+13y=0的通解方程y''=(1+y'*y')/2y的通解 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=? 急,看不懂问我(y+3)^2/8-y=(y+3)/4-(y-1)/2 (y-4)(3y+2)-(3y-7)(2y+1),其中y=4/3 2(y-4)(3y+2)-5(-3y+7)(y+1),其中y=-1 先化简,在求值：6y-(y+2分之y + 2-y分之y)除以y³-4y-2y²+8分之y,其中y= -2分之5先化简,在求值：6y-(y+2分之y + 2-y分之y)除以y³-4y-2y²+8分之y,其中y= -2分之5 解分式方程（y+3)/(y^2+y)-1/(1-y)=4/y要过程 Y的平方+3Y-1=0 y+3-1/y=0 y-1/y=-3 (y-1/y)^2=9 y^2+1/y^2-2=9 y^2+1/y^2=11 (y^2+1/y^2)=121 y^4+1/y^4+y^2+1/y^2-2=9y^2+1/y^2=11那个-2是怎么来的? 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