8y-4.5y-7.5y=-1/2+9/2

y (3y^2+8y-3)-6y(3y+2y-1)+9y 8y-4.5y-7.5y=-1/2+9/2 y- 2y+1/2=9- 8-y/4 y-2y+1/2=9-8-y/4 (y-2)(y^2-6y-9)-y(y^2-2y-15),其中y=1/2.先化简再求值. 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=? [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 方程y''=(1+y'*y')/2y的通解 2y+8y-1=0 y'=1+y^2 通分 y+3/y*y-6y+9,1/2y+6,y-1/y*y-9 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 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) 1/2y^2+3y+7=1/8,则1/4y^2+6y-9= 9y^3-9y^2+2y+1=0 求3y-1=?