|2y-6|=9+4y

(y^2)^4y-(-2y)^3y^6= |2y-6|=9+4y 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) [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^2-6y-9)-y(y^2-2y-15),其中y=1/2.先化简再求值. 2y+5/3y-6-y/2=5y-4/2y-4 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 y (3y^2+8y-3)-6y(3y+2y-1)+9y y- 2y+1/2=9- 8-y/4 y-2y+1/2=9-8-y/4 y^2-6y-2÷2y-4= 2-（4-y)=6y-2（y+1) 2-(4-y)=6y-2(y+1) y^-6y-2;2y-4=多少? y(5y-2)=6-4y 解方程 解方程 4y-2=y-6+7y 已知4x2+9y-4x-6y+2=0 求根号y/根号x+根号y - 根号y/根号x-根号y快. 已知4x2+9y-4x-6y+2=0 求根号y/根号x+根号y - 根号y/根号x-根号y急用.