102=8/(1+y)+8/(1+y)^2+8/(1+y)^3+8/(1+y)^4+108/(1+y)^5 求y=?

y (3y^2+8y-3)-6y(3y+2y-1)+9y 3（3+y)-8y=14 y=-1 y-2[y-4(y-1)]-8=0 y- 2y+1/2=9- 8-y/4 y-2y+1/2=9-8-y/4 102=8/(1+y)+8/(1+y)^2+8/(1+y)^3+8/(1+y)^4+108/(1+y)^5 求y=? 8y-1=4y² 】 2y+8y-1=0 y^+3y-1=0,求y^4/^8-3y^4+1的值 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=? 急,看不懂问我(y+3)^2/8-y=(y+3)/4-(y-1)/2 [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y²+3y-1=0,(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